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The pass line wins ~49.29% of the time and loses ~50.71% this gives the house a 1.41% edge
The don't pass line wins less... ~47.93% and loses ~49.29% because the don't pass line pushes on a 12... the house edge is only ~1.36%
this makes the don't pass line a slightly better wager.
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I didn't think there was that much of a difference. Check out the rec.gambling FAQ:
http://www.conjelco.com/faq/craps.html
It gives 1.4141% and 1.4026% for pass and don't pass, respectively.