I just realized how specialized my playing group is when it comes to chosing our side. Until now, I heavily concentrated on Orks (since Skaven are not a full-fledged faction yet), while my brother only commands Empire, and our third player prefers Chaos above everything else. Reason is that everyone on the table seems to be a huge fanboy for one of the factions. The good point is that every army can be played in different ways and, until now, it has not become boring fighting against my rivals over and over again.
That leads me to my questions for all the glorious / infamous generals gathered here: Is there any tendency like this in your gaming group? Do you happen to play the same faction more than any other? And which is actually your most-loved army in the game? Is it because of its fluff, or because it has a playing mechanic you can use quite effectivly on the battlefield?