It's true that Radiohead are collectively musically more talented than U2, but they do have one extra member.
Plus a lot of their stuff isn't as original as some of their hardcore fanbase seem to think. Some of it is actually quite derivative, as much as is U2's, and I like both bands. The advantage Radiohead have is that many of the artists they use as influences are quite obscure. It's not like U2 with a track like Hold Me Thrill Me, where it's an obvious T-Rex rip-off. I mean, anyone even vaguely familar with 70s glamrock would recognise it straight away.