Blades blades blades. You should play blades. Ignore all that PbtA trash. Blades.

Also, I’m with Cam on Firefly as an iteration of Cortex Plus: it’s designed to serve a particular portion of the market (Firefly fans) with all the baggage and opportunities that come with that market. For my money, I think Marvel is the most fun iteration of the rules, mostly because you don’t need to remember all the bells and whistles for the game to work properly.