Ok, I'm gonna give a more detailed list.
Top 5 Autobots: Jazz (I've been a Jazz fan since the first time I ever saw him. Probably the biggest reason I like him is the fact that he adds a little style to everything he does, which is something I tend to do as well.)
Blaster (I'm a huge music fan and I play several instruments. That being said, it's obvious that I'd be able to relate pretty well to this guy.)
Sideswipe (Sideswipe is a great character, and I'm pretty sure my favorite scenes are when he tackles Starscream and threatens to beat him up, because I have a friend [who I just happen to call Screamer] that gets on my nerves sometimes. I've never really hit him or anything, but I'm big enough to just scare him into being quiet.

)
Bluestreak (I've been a big fan of Scooby Doo for as long as I can remember, so being voiced by Kasey Kasem is a huge contributing factor. I like his alternate mode [and the paint job is my favorite of the three 280ZX's], and he has pretty much the same personality as Shaggy, who is another favorite cartoon character of mine.)
Optimus Prime (I'm gonna make this one short. C'mon... who DOESN'T like the big guy?

)
Okay, top 5 Decepticons: Skywarp (Being somewhat of a comedian and pulling pranks is something I can also relate to. Classic pranks or crazy new ideas, I love it all.)
Starscream (Once again, who doesn't love this guy? He's just that cool.)
Shrapnel (Hahahahahaha, my favorite of the insecticons, I like how he always repeats the last word of each sentance. Eating anything in sight and commenting on the taste is just plain awesome.)
Soundwave (Soundwave is great because of... well... I'm not really sure why, but he's just such an iconic character, and always had a good role in the show that he's made it to #4 on my list of 'cons.)
Shockwave (The fact that he's always willing to follow orders and thinks things through makes him a great soldier. I always thought he was cool and sitting around doing pretty much nothing while everyone else is somewhere else? Hahaha, I think we've all experienced this a time or two.)