Bowker or Lewis? Lewis or Bowker?

I have a question to pose.  This season the two top Giants everyday rookies, John Bowker and Freddie Lewis, have hit .274 and .273, respectively.  Lewis' career average is .283, while since all Bowker's at bats are this season, his is the same .274 as his season's average.

So my question is this:  Which player is more likely to maintain or improve his seasonal batting average, and why?

I have done some research on the matter and have some ideas, but before I get into them, I'm curious as to what others think -- and their reasons for doing so.

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