Pretty sure the "Pro" models are more oriented towards commercial applications that need 24/7 uptime and lots of read/writes.
I have an Evo, and can tell you the speeds are great, hit advertised benchmarks, and the software is excellent.
For me, the price difference meant a bit of budget stretching let me get the 500GB Evo, versus the 250GB Pro.
Twice the space for "some" more money, and close to the same speeds. More practical for gaming/home user set ups IMO.