>>7980202In terms of sculpt and overall proportions, definitely the new ROTJ SHF. But the Mafex Rogue One and model kit are closely tied (and better in some areas).
HOWEVER, if you're concious about price and not picky about his exact costume then there really is no beating the Black series 40th Anniversary Vader. He's quite possibly the best figure they've ever done and fits like a glove into any display.