Cybertron, that design just went perfectly with the G1 Megatron colors and dare I say that purple face was a nice touch too lol. To me his design is flawless and IMO is easily the coolest looking Galvatron of them all, heh.
I would say G1, but I only liked his cartoon/comic design and not that of his original toy, so I went with IDW, which is more along the lines of what I like.
G1 or IDW easily. Far more than "Megatron with a new paintjob" from both RiD '01 and the Unicron Trilogy, or that hideous abomination from AoE.
G1, BWII, RID, Energon, Cybertron, Prime even though he was never actually called Galvatron he should have been.
For me, it's a tosssup between Furman-era IDW and AoE. IDW is an excellent update, and AoE is more unique. RID01 Galvatron is a runner-up, only because his colors better suit Megatron.
G1. Nothing can beat two scenes design wise: The moment he shouts at WeirdRider for 'breaking the matrix' is the model scene IMHO of what Galvatron is design wise and the second one is in the Return of Optimus Prime part two, when he shoots at the cave sealing and then transforms to robot mode to talk with Optimus.
I'll be honest................. if not for that head/crown gimmick.......... I might - MIGHT - have replaced my Maniaking with him.