Between the PRO 250GB and the EVO 500 the EVO really is the better choice.
- The PRO has a longer warrantey (10 years...which is insane), but really is a step above the EVO line because it has better performance
- The advantage in performance of the 250GB PRO vs. the 500GB EVO is lessened because SSD's get a boost to performance when they reach the 500GB mark
-In summary, the advantage of the PRO line is nullified by the fact that you're comparing a 250GB model to a 500GB EVO. For the same price, very close performance, and twice as much space, get the EVO.