Tough to pick just 5 lmao, this post is super long because I geeked out, my bad it happens a lot to me...
My favorite album is In Rainbows by far as I see it as a perfect album that has no bad tracks.
For my favorite tracks I think I would go with:
1. How To Disappear Completely (Kid A)
2. Pyramid Song (Amnesiac)
3. Jigsaw Falling Into Place (In Rainbows)
4. Videotape (In Rainbows) [I would recomend the Bonnaroo live version as well, as it just adds a killer baseline]
5. Let Down (OK Computer)
Other than my top 2, any of those is subject to change for me which is why this is so frustratingly hard to pick just 5, but some other favorites album wise:
The Bends: The first 8 tracks as well as Black Star and Street Spirit (I know that's most of the ablum but I've always found this to be a surpisingly underrated album imo, btw Planet Telex is my favorite song of it)
OK Computer: The first 3 tracks as well as Karma Police and No Suprises from the main album and the tracks Polyethylene, Pearly, and especially Palo Alto from the OKNOTOK version (I'm suprised no one really talks about it)
Kid A: Everything In Its Right Place, Kid A, Treefingers, Optimistic and Morning Bell (especially Morning Bell)
Amnesiac: You And Whose Army and Knives Out are two of the tracks that might be in my top 5 and Follow Me Around off the Kid Amnesia album is so underrated
Hail To The Thief: 2 +2 = 5, There There, A Punch Up at a Wedding, Myxomatosis, and Wolf At The Door (Another underrated album)
I already said In Rainbows is perfect so all of the tracks are incredable but Bangers and Mash off the extended album is great
Morning Mr Magpie and Lotus Flower off of King Of Limbs
A Moon Shaped Pool is just to be best experienced all in one sitting imo, so I can't pick just one
And for some real deep cuts would be Killer Cars, anything by the band The Smile, which has most of the Radiohead members, and Creep (only good song off of Pablo Honey, but it gets unfairly dumped on)
Sorry this was so long, I just nerd out with my favorite bands, especially with Radiohead.