I fully agree with all of that.I like then both too. I Already have assisted to (live) concerts of each of them.
But my preference goes to radiohead... by far.
'Cause they are more "consistent".
i.e., I can say that I am a fan of every Radiohead album.
"Ok computer" is one of the best albums Ever!
I think i've never listened to Radiohead, and i've only heard one Smashing Pumpkins song(the one of GHIII) and that song was pretty good.
The only "heavy" song I can say Radiohead did was Creep.