What are your favorite units?

[Panzer VI]

I have to go with:
German: PzGr Platoons, StuG IIIs, MG Platoons
Russian/Soviet: T-34/85s, BA-64 Armored Cars
American: M4s w/ 105mm, M16 Quad Halftracks
British: VC Fireflies, Crusader Tanks, Universal Carriers w/ Carrier Infantry
Japanese: Japanese Infantry and Officers
In-General: Engineers, as these guys work wonders when there are no tanks present on the battlefield.

Least Favorites: Japanese Armor, On-Map Aircraft.