S1;Zoro and Ace are strongest of their respective groups. Zoro seem to be superior to Ace according to feats but Oda hyped Ace way more than Zoro and even Luffy for that matter. So, I am giving Ace the benefit of doubt until we get to know more about Zoro. About Jimbe, I think he's currently superior to Sanji. IMO, The reason why Oda tried to avoid Jimbe from joining is that Jimbe may disturb the power structure of the crew. Not to mention, Jimbe operates alone akin to Mihawk and still has a bounty that high. The main attribute about Jimbe that the Gov considers to be a threat to them is without a question his strength which insinuates that most of his bounty reflects his strength unlike people like Jack,Kid and Luffy. That alone speaks for volumes.
So, I'd give it to Team Ace. But Zoro's team'd win, strictly going by feats. That too mainly because of Zoro.
S2: There is no doubt Zoro and Law wins this. Regardless of who's stronger than who, Law would be the best supporter in a fight.