You really cant go wrong with either set. The infins are pricey compared to the K&Bs
I havent had a set of K&Bs yet to try, but I can tell you ive had the infinivations sience they were released, and they are lasting forever. Havent cracked them in crashes(4), have not had to replace the orings yet. Tad bit loose in the head due to the orings needing replacing though. Do you really need to replace them? I dont think so...been running this set of orings now for about 10 gallons.
But for the money....K&Bs get my vote
Mikado "V Team"