I think his devil fruits ability gives him advantage over Kid's.

I agree.

He controls magnetism. Law's ability is dependent on the correct usage of a series of metal blades. Ergo, Kidd's ability makes Law's far more difficult to use correctly, or at all for that matter.

i agree with u white flames.........he he heh he

I see what Whiteflame is saying, but even so, Law has control in the sphere... Plus, I don't think we've seen all his abilities yet, either. I'm sure he'd have a contingency plan in case he ever came into conflict with Kidd - They did spend a bit of time together, too. Honestly, I think Law is faster and more precise than Kidd's clumsy, broad attacks. However, I guess it could go both ways... Kidd is strong and violent. Still, I'm going with Law.

I guess I can see your point, though it seems like Law's abilities don't affect the abilities of other users.

^ Maybe. I think of all the fights that are possible, this would one of the few where I would find it very hard to predict what would actually happen. I just get the feeling that Kidd would be slower, less careful and a bit clumsy and over-destructive with his attacks, whereas Law fights smart and wouldn't waste energy while Kidd is using his powers to try and get him with the Magnetism ability. All in all, though, it would be an awesome fight!