I have been looking for that very same comparison, but failed to find one. But since the Aplha was not available over here, the choice was easy; i got a Swiftech MC-462A , and I must say I'm very impressed with it. I attached a 80mm Pabst NLM fan, and it keeps my 1.4 tbird very cool (46° under Seti) and extremely silent.
Not sure if the Alpha PAL has clips, but if it does, I'd go for the swiftech if it where only for the mounting mechanism which is both extremely easy, and reliable. Quite a difference with my previous Silverado that scared the hell out of me by being so heavy and only attached by two flimsy clips.
---- Quote of the day: "I hope admin can delete massages.."