Is playing two of these bit much/unnecessary? Are there any good teams to be made? Or is Captain Marvel better than a second Thor?

I vote for Capt Marvel

Any luck deciding on your team?

considering the amount of stealth and outwit that is out there, i'd vote Thor & Cap Marvel. at least Cap Marvel can deal with the Stealth guys a little easier. i assume you'd play them both at full, so not sure what you'd fill the remaining 25 with. maybe Pepper to keep theme. give her Theme Prob's when you really need them (like if you roll a Crit Miss) and the extra perplex is always nice.

If it were up to me id probably play Thor at 75 and Capt Marvel at 95. That gives you 130 points for support. Maybe a tertiary attacker.. just be careful of the outwit.