Of the 'Three of perfect pair' trio of albums, I'm actually quite fond of Beat, despite it arguably being the most commercial of the set. The title track on TOOPP is 80's KC at its best though.
Interesting your mention of Radiohead. From Ok Computer onward, I always regarded them as a prog rock band, before I was aware of any attempt to label them as such. They are prog by definition IMO, purely because they have a progressive approach to making music, with each album only loosely following their formula of combining electonica with guitar music. Their 'anything goes' approach to making music is similar to that of KC, I agree, although Fripp ensured a constantly changing approach to songwriting by changing line ups or at least key members from one album to the next, whereas RH at least stuck together!
OK Computer remains in my top 10 albums of all time. In Rainbows and Kid A also rank highly for me, and being a closet Indie kid, The Bends is an album I'll always love. Good days!