Theyre both pretty good, it wouldnt really matter, i mean Palit's cooler might look like one that would be better at cooling but ive heard good reviews of Galaxy's cooler as well.
Then again i havent heard good things about Palits warranty:
The Palit RMA home page states that the original distributor will cover the warranty, but neither the site or the product box and packaging tell you anything about a warranty. Legit Reviews contacted Palit about the warranty and was told this about the warranty: "Currently 2 Years but looking at the numbers for 3 year with possible customer options to purchase more." It seems that Palit has a two year warranty of some sort that goes through where you purchase the card from. Palit certainly has a great product, but the warranty isn't as clear as either EVGA and XFX.
Its up to you.