Both will last fine. The two computers themselves are close to the same. It's more or less between picking a car with the standard package, or the same car with the fully upgraded package.
The Pro has the following, which the normal does not... (base model Pro)
Unibody aluminum casing
Multi-touch glass trackpad
Capability of 8gb RAM
.13 faster processor
Up to 7 hours battery life (I myself have gotten more than 7)
(I personally would/did go with the pro, for the above reasons. My high school also used the white MacBooks, and they discolored fairly quickly, though can be cleaned.)