Man, this is a tough choice.
The Bends is good, and Pablo Honey is decent, but neither really compare to their other albums.
Kid A and OK Computer are probably the most consistent albums, but Amnesiac, Hail to the Thief, and In Rainbows all have individual songs that are much better than anything on Kid A or Computer.
Breaking it down by album and the number of songs that I love from that album:
OK Computer
Paranoid Android
Exit Music (For a Film)
Electioneering
No Surprises
Kid A
Everything in its Right Place
The National Anthem
Idioteque
Amnesiac
Pyramid Song
You and Whose Army
Hunting Bears
Like Spinning Plates
Life in a Glass House
Hail to the Thief
2+2=5
Sit Down, Stand Up
Go to Sleep
There There
A Punch Up at a Wedding
Myxamatosis
In Rainbows
15 Step
Bodysnatchers
Nude
Reckoner
Jigsaw Falling Into Place
Now, dividing the number of loved songs by number of songs on the album, I should be able to find quantities that show my rankings.
OK Computer: 4/12 = .33
Kid A: 3/10 = .3
Amnesiac: 5/11 = .45
Hail to the Thief: 6/14 = .43
In Rainbows: 5/10 = .5
So, by that logic, my favorite Radiohead album is In Rainbows, and they are ranked:
In Rainbows
Amnesiac
Hail to the Thief
OK Computer
Kid A
The Bends
Pablo Honey