That's a viable option, unless they have speed +10 ships or planets near you. Then you just have to be careful about it. |
Clearly, as I've said before, there's no single correct way to play this game, there are many viable strategies.
With that said, I think combat ships are more effective conquering someone else's planets instead of sitting around in orbit on all your planets just in case someone comes by with a troop transport.
When you get into a defensive mode then the battles, ships and action tend to be around your planets instead of your opponents planets. I find that trying to go back and forth with your ships alternately trying to defend your planets while also trying to mount an attack merely dilutes your effort.
War generally slows down research and economic development. When I get into a war I try to end it as soon as possible so I lose as little development as possible with respect to AI's that are at peace. I usually find that the quickest way to end a war is to take all the opponents planets as quick as possible. Once he's crippled then you can take back any of your worlds that he's taken and repair the starbases that the AI loves so much to destroy.
It's realy a matter of rate. If you can take 10 of his planets versus every one he takes that's better than taking the same amount of time to take 5 of his planets while preventing him from taking any.
Anyway, that's just my opinion. The beauty of this game is the wide variety of sucessful options.