I've only seen a couple episodes of the new series, Transformers: Robots in Disguise. Although Beast Wars had much stronger stories, I still prefer my transformers to turn into vehicles or machines, and I still prefer classic animation to computer 3D animation. I'd never buy an "Optimus Primal", but the new Optimus Prime that combines with Ultra Magnus... yeah, I'd buy that.
Favorite Autobot: Gotta go with Optimus Prime, although Jetfire is a close second (wish they'd used him more in the cartoon or the comics!). And Cliffhanger will always be one of my faves, since he was the first Transformer I got as a kid. Plus, Casey Kasem did his voice! How can you not be cool when you've got the same voice as Robin the Boy Wonder and Mark, leader of G-Force?
Favorite Decepticon: None of them ever really won me over as being as cool as the autobots. I always thought Ravage was pretty cool, though.