Well i think that GG's death was kinda "cartoony" and didnt fit the movie...to me. There was no reason for his head to "explode". but overall, id have to say the best was Qui-Gon's...minus the living long enough to to impart his final words on Ob1. But he never saw it comming and the way Maul got him and didnt even care to watch the body drop. But most emotional would be Vaders.