Pick anything you'd like. I'm interested in doing some battles in which the commanders are concerned with what happens AFTER this hour's fighting has past, and they've got to think about what happens next to their troops and the mission coming up. Seems more realistic than the 'all-in/hell-for-leather/cost-is-no-object' approach seen in one-off battles.
SO...stick me with any mission and any army but the Italians.
I'm afraid the campaign in CMx2 - unlike Cmx1's operations - are not playable against human opponents, if i correctly read your post. So,for the time being,until BFC decides to implement H2H campaigns, we're stuck with the regular scenarios/QBs.