Possibly Deluxe United Stepper. the mold is great, and he may just have the singular best paint job in TF history. Maybe. Seige Jetfire'd be up there, overpriced though he may be. Neve thought they'd eb able to pull off an animation style Skyfire - Especially looking at how bad most of the KO company versions were. T30 Springer gets disqualified for "best" by me for being a QC mess, but he's still pretty great. i've never owned him but MP Soundwave looks like he should be up there. Trypticon would be a contender. The BB Movie Optimus. (wish i'd grabbed him when i saw him one time!). while i wouldn't put him anywhere near the best, the was a fun little mold that always feels underrated (Huffer was cool too)... although, technically, didn't PCC come out last decade? (i thought they were ROTF-era.) utterly shocked at how many folks have mentioned Siege Optimus. The sheet of plywood strapped to his back and ridiculous alt mode instantly disqualify him for me, before even talking about the goofy smokestacks, no matter how "Sunbow" (and good!) he looks in robot mode. Or Siege Starscream with the off model tetra jet alt mode, spectacular level of over-detailing and alt mode and robot mode that can be achieved separately because they are 2 completely unrelated halves. I rail against this mold a lot, but it kind of makes me angry with how poor it's execution as a Transformer is.. I'll never be convinced they couldn't AT THE VERY LEAST made the legs convert into the nosecone of the alt mode. (pix courtesy of @Space Skeletor 's Jetfire review) I feel like there's gotta be a weird intersection of recency bias + Sunbow G1 bias combing with the amount of love this line gets. And i'm not totally hating on it, i think it's got some impressive molds, but it just doesn't seem to deserve the crazy level of hype it gets.