That's like saying Godzilla is heavier than King Kong... shrug
Tuniq Tower is probably the best air cooler, but either way, the top are all at the top, performance should all be relatively similar...
Actually i just looked it up. The Infinity is quite a bit heavier weighing in at 2.1lbs. The Ultra is 1.6(w/o fan).
As for the Tuniq, I'm not sure. I havent seen any reviews comparing the two. I have seen many with the Ultra 120 outperforming the Ninja, Infinity, anything Thermaltake, and Zalman.
I just purchased a Vigor TEC to replace my Ultra 120. Ill be doing a review on the temp/performance differences. If any1 with a Tuniq Tower 120 would like to use my Ultra 120 to compare the two let me know. Ill let u use it for testing if you post the results =) (as long as i get it back).