Typically, the Cole uses a single to double concave bottom, whereas the Stretch Fletcher uses a single concave throughout. This makes the Cole work better in the all-around category, whereas the Stretch will excel in hollow/fast surf. I loved my Cole, but it had too much volume for me. So I sold it to SB_Surfer who I think really likes it/loves it, and I ordered a new one for myself. They are well worth it. Stretch is no slouch either, but I wanted to go with someone I'd known of for my first real performance quad. Cole was well worth it.
I've posted this up a bunch, but here's an old review:
Review here.
Plus, you should check out the "Once & For All" thread on quad fin set-ups.
-ShShSh