Hmm, I think well...

Hotohori's got that whole ki thing going on, plus 
he's a ghost isn't he? Kenshin wouldn't be able 
to even hit him if he had a body. ;P

But ok, with a body, think Kenshin would win. 
Nobody can defeat him, but well, if you think 
about it, it would be a draw. They both would not 
give up, would fight until one person drops, and 
they'd both drop at the same time.

Now, in a pie eating contest that's another 
story...Miaka would put them all to shame! :)