I guess I'm kinda impartial. If it transforms, its amazing. If its articulate or has its own unique function, that's just as cool. It's the brand itself which you should be interested in. Mind you, Hasbro can pull some really weird shit out that's kinda both transforming and nontransforming. I'm looking at you Hero Mashers.

I have a Revoltech Jetwing Optimus. Kinda really cool. Can get some super dynamic poses with him and his weapons. I'd get more if I could. A cheap DMK would be amazing.
I also have a custom Leader Class ROTF The Fallen, something I build myself. Doesn't really transform either.