It's still in development and in some ways might be better than SOASE'R.
If you like a very deep complex game than Endless Space is the better choice but the slowness of it might turn people off. You'll find it hard for CnC and Starcraft guys to get themselves into that let alone SOASE.
It depends on your play style and preferences.
If you like speed but 4x but not overwelming you go SOASE'R. If you like to pace yourself and have full control over everything then go Endless Space.
