Mi nuh know.
Just a note, these are all prominent mangaka who are famous in the manga community for their works and with the exception of Katsura Hoshino, they all have many hundreds of manga chapters under their belt.
Blah blah blah, I can't say they're all famous so it'd be better to say they're all infamous. Whatever. Put your fanboy hat down Whitebeard.
Ok...Why did I choose Oda?
1) The guy is the most skilled at having a 500+ manga that's still going strong and still interesting as hell. If that doesn't deserve props...I dunno what does.
2) He's the only mangaka whose cover pages tell a separate story and I find that to be absolutely awesome.