Every Transformers fan loves a certain character, or maybe even all characters. When you guys think of or see a certain character, what is the look that you'll always love more than the rest? For me, this exact image is Optimus Prime and it will always be.
I'm gonna go with the the Original Cartoon.. and or anything Geoff Senior or Lee Sullivan illustrated for the Marvel Comics.. the Early comics are not bad but they changed between being illustrations of the toys and then slowly evolving to more closely match the cartoon.
"Now, remember, before you do anything, think, 'Is this what Sky Lynx would do in my position?' and you will not go far wrong." Wise mech, indeed. - Coeloptera
As a fan of TFs, and a fan of pretty much every series of TFs in some way, I cannot say there is a definitve look in my opinion. Too much to me sticks out as the ultimate image of Transformers for me to pick just one.