As for polls, they are like statistics. They can be bent any damned way you want if you need them to and frequently involve waffles.
I get the impression that GalCiv players are the kind of people who prefer Solitare. On the flip side, SE players are more Poker, Blackjack, and Baccarat type of people.
I like GalCiv, what draws me to SE is the complexity. Combat is pretty simple in GC, very rock paper scissors and linear. Weapons don't really differ except in power/cost. Since SE has tactical combat it opens up allot more. Other then that i like GC just fine.