Well, in DoW2 I got a 3 Predators PANZER BATTALION!!! =D
Not many, but better than the usual 2 in DoW1...
My favourite unit are... ow, that's a difficult question! I like them all! Well, when it comes to choose, I choose tactical space marines: good in hand to hand and effective special weapons: they saved my other troops against vehicles with their RLs many times. ^^
Talking about heroes, besides the fact I, again, like them all three equally, I usually play as Techmarine or Force Commander: I like playing defensive but I also like FC in termie suit! =D
BTW, imho IG is just what a Company-of-Heroes-Based-game needs... also, what do you think its heroes would be? I'd say: General, Techpriest and Commissar (but I also think that they'd add a 4th hero in an expansion... c'mon, where's the Librarian, Relic? =P).