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Hard to say, since shou is presumed, or is dead. Natsu could've had quite a development after his death.
Well, realistically speaking it would make sense kano was the stronger one if they met at the same point in time. At least the things which could potentially give natsu a victory are not quite the things we can count on in a thread like this IMO. Kano in the end was a bit of a speed demon, he had deadly techniques from all of the masters including sougetsu and had the talent to apply them quite well. It is still a fact that kano is the only disciple we have seen to apply techniques in the exact same manner as his master, most disciples use weaker versions than the techniques their masters show.
I stated before (still think that way), that Sho can out-skill any non-protagonist disciple. He did it every time and only lost to Kenichi.