It would be an interesting fight, which is why I suggested it for the debate tournament.
Kakashi's sharingan gives him the ability to dodge even fast techniques at close range, even while engaging another opponent
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. Off the top of my head, I don't recall Kisame having a technique any faster than Kakuzu's futon blast, but either way it's just a point to make that
Kakashi doesn't have to match Kisame's suiton....although, he potentially can.
If Kisame decides to turn the battlefield in to a lake, it really doesn't hurt Kakashi as much as one would believe. He's already shown he's capable of copying high level suiton techniques when he has a water source
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. Remember, the ranking of a technique is based on how difficult it is to perform. Not only has Kakashi proved he's capable of high level suiton(even when his chakra was 4 to 5 times less than what it is now), he also impressed Kisame himself with how effective he was with it
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, that of course not only came after Kakashi used a suiton clone effectively, but after he copied Kisame's water shark technique
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.
Kakashi's kinjutsu feats also surpass that of Kisame. Among those feats is not only his use of the kubikiribocho, but him being able to combat Zabuza with just a kunai against the kubikiribocho -
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.
I'm not 100% sure on who I would pick to win, but whoever wins it would be with the upmost difficulty.
Kisame isn't going to beat Kakashi with just suiton, though.