Anandtech's most recent article has both of these mounted with the Delta 7000 RPM 38 cfm fan and they had the same performance. Both are good and I would say buy whichever one you can find for less money with that fan. I personally picked up the Alpha Pep66T with the Delta fan for $32 recently. I will say also that Vantec has a really good copper cooler that is at a good price. It's the CCK-6035D and from some reviews it looks like it outperforms either of the ones you mentioned with that same fan.