I like rifleman and support, when I'm sewer ratting I use support on either team, and when I'm up top I use rifleman, both teams of course. Preferable axis, but on AVA I usually pick us. For Donner it doesn't matter which team.
I like playing sniper/rocket whenever I get to have the weapon on axis/allies on Ava but I will play which ever other weapon is needed to help our team win.
On Donner/Kalt I usually like playing support only because I like to charge and try to cap flags whether I'm on the axis or allies.
Panzerschreck and on the rare occasions when I play Allies, bazooka. If they're unavailable, I'll go Support. I'll pick up a Thompson whenever I find one and I don't have a Rocket, though.