Lol, i cant even believe this is a contest. I think a lot of this stems from peoples love of Lorne (which, i agree, hes a great character), but in a fight hes seriously got nothin 'cept maybe a gun.
I always figured sweet as essentially Satan of his own dimension. I mean, he had the power to take out whoever he wants, he would have taken Dawn against Buffy's will if it wasnt for the fact that Xander admitted he summoned him (or lied if you want to take that point of view). Sweet did what he pleased, he sat back doing jack all as Buffy damn near killed herself were it not for spike coming in. He had COMPLETE power over people, whoever he chose without them being able to fight back!!
Not only that... but he had MOVES... i remember watching OMWF for the first time, searching the internet half way though for who the actor was cause i wanted to see more of this. Was totally mesmorizing so yea.... Sweet im afraid... all Lorne has is a the power to sing at high pitch and read people, but considering Sweet has total power over all, hes no match. Any argument with this is more about your love of Lorne and wanting him to come out on top imo.