While I don't have the 80's Pepsi Optimus Prime, I have both of the newer versions from around a decade ago. It's another particular favorite of mine for sillier reasons I suppose, but I doubt there's any real serious reasons for having preferences in a toy robot hobby. I'm a soda junkie. Drink it way more than I should and relish every drop I drink. Love it. Despite being from Georgia, I've always vastly preferred Pepsi and Pepsi products. I doubt I'd have to elaborate much further as to why I'd find a Pepsi edition of Optimus Prime favorable.
Just look at that, that's great.