This is based off a forthcoming review of the water 2.0 Pro, so take with it what you will.
Corsair and Thermaltake are going at it blow for blow with their current models of closed-loop coolers. The H80 and Pro are nearly identical, but the Pro 2.0 is superior in my experience.
Both coolers have similar (+-2 C) cooling performance.
Both coolers have the same profile.
Both coolers are from companies that make good on warranties (~sigh~).
The H80 is better if:
You spend another 100 USD to buy the digital control, not included with the product.
Are willing to set the cooler pump speed, then forget it.
The Pro is better:
Instructions written by competent people.
Sufficiently thought out mounting hardware for pretty much any situation.
Better pricing, as of this writing.
More flexible tubing between radiator and contact plate (making install much easier).
More flexible mounting, making installation easier.
My first Corsair H80 was DOA, and it took two weeks to get a replacement (new in sealed box though, so take from that what you will). Again, I can't stress how much better the Pro was during installation! It was great to get directions that made sense, and a mounting system that wasn't an afterthought.
