Interested in both ideas, they sound like really fun, high-energy concepts with plenty of opportunities for interesting group dynamics and events. I am down for either honestly but my vote is currently for the second. The only thing is that both concepts are really dependent on the functionality of the team; if everybody wants to be an indestructible god (which is what people tend to lean towards, and more applicable to the first choice) it makes things less interesting.

EDIT: really can't decide! I will admit the first option sounds like a good deal of fun.