A thread at WebmasterWorld named What arrives faster? Checks or EFT? Based on the AdSense payment options screen you really have three options:
Of which, the first two give you a hint on when you can expect payment:
*Standard Delivery checks are sent by regular mail and should arrive within 2-3 weeks of the mailing date. **Secured Express Delivery checks are sent via courier and should arrive within 1 week.
EFT, well that is beta, so we need to go to the forums and see what people have been experiencing. From skimming that thread, it seems that it totally depends on where you live. If you live in the middle of the dessert (no offense if you do live in the middle of the dessert) then it can take a lot longer to get you check. So EFT would be quicker. I personally opt for the 1st option at this point.