Jazz seems to be a pretty hardcore choice XD I'm not surprised, though. His speed and lethal weapons would definitely give him an edge
I'm pretty good at sniping and flying, so my favorite Decepticons are Sideways and Starscream and my favorite Autobot is Breakaway.
Autobots: Ratchet, G1 Optimus, Movie Optimus, Ironhide, Jazz, and Sideswipe Decepticons: Grindor, Soundwave, Starscream I honestly suck at being a flyer, so I don't care for the Decepticons, mostly.
They all have their ups and downs. Grindor and Jazz are so overused. They are like the oh no I am losing better bring out Jazz or Grindor. Don't get me wrong they are fun to play as, but not all the time. My personal favorite for me is Sideswipe. He is my favorite Autobot after all. As for the Decepticons, I would say Sideways is my favorite. He has great weapons and the speed to match.
The only problem with Ironhide is that he is a short range specialist. None of his weapons will hit any thing that is too far away. Making him easily killed off by air attacks. But up close and personal, cons beware.
Both have pros and cons. I'm pretty gooed with good 'ol Bee. Nice rapid-fire primary, lock-on missiles for secondary, and I can make mincemeat of any Con who comes near me thanks to the stun.