ub starts with 6.3 then gets 3%, 7% and 10% with inner beast which means he will have 6.9 movement speed.
sed starts with 6.0 then gets 5%, 10% and 15% with inner grace --------------------------> 6.9 movement speed.
with boots of speed they both have 7.5 movement speed...
hui is correct: UB actually gets 6.93, not 6.90.
With BoS UB gets 7.56, Sedna has 7.5.
Then comes the fact that a UB will typically skill one point in Diseased Claws, snaring Sedna an extra 5%.
Not to mention:
UB has Spit... Sedna has no ranged.
UB farms faster, better, and scales stronger (Ooze will kill creeps faster than a flag cap).
UB pushes towers better
UB can use more expensive items (Narmoth's, Orb of Defiance) better than Sedna (though Sedna does have the option of getting Bishops which is big)
Level 1 speed advantage is much more important than... any other level speed advantage. This is because of the farming + fast cap advantages, as well as the fact that people haven't all leveled up their snares and stuns yet.
i guess I can amend that statement with "at level 20, significant speed advantage is even better than speed advantage at level 1" because of annoying portal bullshit using Journeymans. That's another matter entirely though.
Guess who is faster at level 1?
However, we can talk about how sedna and ub fight each other in 1v1, 2v2, 3v3, lvl depended, and what is happening on the map. However try to give some reasoning for why you think what is right
i do think that swapping a Sedna over to the mana side to lane against a UB in a 2v2 situation can be reasonable (depending on what is being laned in the health lane). Sedna can do pretty well against the harass that a UB can dish out, and she can "survive" a UB combo... that doesn't mean she can kill him at all though.
Also, equally geared and leveled... a Sedna will beat a UB at the EXP flag (anything in lane will work in UB's advantage due to Ooze). And assuming no silly things like Artifacts. Also there are a few levels/situations where the UB can win (level 5-6 for example. UB doesn't give a fuck about Silence: it's too early for Sigils anyway, Sedna doesn't have CH, and she can't cleanse).
However: long skirmishes (and it's Sedna... it's gonna be a long skirmish) is extremely risky at the EXP flag. UB has the leisure of saving a grasp until just before their ally comes out of Fog of War. Sedna has... a 400 damage pounce? Silencing a Sigil (if the UB is actually that low for some reason).
However, if it isn't equally geared, it's extremely frustrating. One of the worst Demigod moments of mine was Orcun's UB on the "gold flag spot' where you can stand without being shot by any of the three towers protecting it... and he's way over leveled than me.
Even though it's out of lane (and he literally can't move because if he does he'll be shot by the tower): still can't beat that. And if i stand on my side of the flag, i'm out of EXP range and not really accomplishing anything other than ensuring that my team keeps it's GPS.
That said, an undergeared Sedna (properly played) can very well run an enemy UB oom without running themselves oom. Although the Sedna will give up territory, and won't be winning any fights, the oom'd UB will be weakened and if you can force a team fight your (hopefully not oom'd UB) will outmuscle them.
About your guide since you specifically asked me about it:
Leveling up Grasp is really strange. Massively increased mana costs, for a small increase in damage and health regen... except for the fact that most UBs break Grasp as soon as it is casted.
Think you did a good job outlaying the Plenor v Vlemish debate... lotsa conflict on that.
i do really like Ooze Beast, though. Even if i do think that it is inferior. Just waste a lot of damage potential for only small passive gains. i do think it is super powerful in 2v2 or against any non-UB non-Rook team (that said, if you have a UB and a standard health side composition, and the opponents don't have UB /or/ Rook, really it's your game to lose).
That said, i really, really disagree with your statement that UB is underpowered. i mean really?
UB is always one of the strongest demigods...
at any stage of the game
on any map
with any team composition
in any game mode
with any number of players
against any team composition
winning ranged trades (Fireball me TB? okay here is a Spit... you took 10% of my health but i took 20%).
winning melee trades
UB lacks an escape mechanism? Sorta... he's fast to begin with. He has high passive survivability (Ooze and also his armor/level growth). Acclimation makes him nearly unkillable with monk + sigils. Journeymans and Orb of Defiance both "exist" and are both super powerful on him.
For most of the game, his "escape mechanism" is "i kill you if you fuck with me" because for most of the game almost no one can afford to go balls-out on UB and secure a kill. Most of the other demigods relay on superior positioning and slowly working UB down (TB, Regulus, Occulus), or running UB oom and then killing him (Erebus, Sedna), or engaging UB only on their own favorable terms (Rook, Queen).
Does this make him vulnerable to ganks? Hell yes (well until Journeymans at least).
Are ganks super popular on the mana side? Ehhh... not really.
Does UB require a high skill cap in pro level games (despite the fact no one levels wrath, and Ooze is a one-button miracle and so UB uses 2 skills and right clicks)?
Why? Because UB is so goddamn strong, he wins teamfights... so the other team also has a UB... and so team fights are literally "which UB is better"... and so your perfect positioning and calculations dictates who wins the teamfight... which determines who dominates flags and towers... which leads to more gold and earlier giants... which leads to portals... which leads to victory.
Consider a Queen or a TB (both of who have loads of buttons to push, with low innate survivability... well Queen not so much with Mulch + Shield, but she has super low base health).
Who do you think has a harder time playing?
The Queen/TB against the UB?
Or the UB?
Definitely the Queen/TB. The skill cap exists for UB simply because having a UB is so essential in high level games that you're always having to lane against another UB... and the hardest lane is a lane against a UB.
Also, my understanding is that scailmail + scaled helm is the best starting items for UB. This might be just a flawed memory of mine... but that is what i remember Orcun doing.
Also i do think that Post Mortem @ 16, Plague, Plague, 2x Enhanced Attributes is the way to do the last five levels with a standard Blood build. Post Mortem gives a huge amount of damage potential in-lane with giants and such (and lets you clear like a boss). Plague is useful to let your army very slowly push both lanes without having to even trying. The problem that PM isn't used earlier is because of the EXP bug in non-Uberfixed games, and you lose some damage compared to leveling Spit/Ooze. Plus, i think that the 2 levels of Plague is actually slightly more team fight damage than the equivalent 2 levels of Enhanced Attributes.
Agree with LORD_ORION about getting NR if you're running BotS. NR is such a fantastic item. The damage you get is redic.
i also think that if you're running BotS, you tend to get Bestial Wrath 16-20. BotS can afford the extra mana costs, the passive on the final level of Wrath is useful, and level 16-20 is when Bestial Wrath is actually "good" anyway.