I'm partial to Bombstrike myself.

It mostly has to do that she's a brand new character and figure. She hasn't really had the comic 'destroy' her character and there's been no cartoon interference. She's pretty much a blank slate and the rough backstory Hasbro gave her is pretty cool. And the fact that Barrel Roll and Blackout are her brothers, it sets up a great dynamic.

I never cared all that much for the females of GI Joe. Tho VvV Jinx is pretty cool in my book.