1. Balance Of Power/Confidence & Paranoia TIE
(for "Mozart, Mendelssohn, Motorhead", Petersen's Arm, and Rimmer's doomed attempt at impersonating Kochanski. "Woman's Period" LOL. Love Craig Ferguson as Confidence, the show's first guest villain, and the bait and switch with Kochanski's holo-disk is one of Rimmer's greatest Being A Jerk moments. I'm kinda glad the 1988 strike at the BBC forced them to audible away their original plan of Hologram Kochanski as Season 1's Cliffhanger Ending. Also, love for the underrated sci-fi concept of pneumonia mutating such that your fever dreams come to life. Cat playing with his food, also funny.)
[Picking a Season 1 favorite is not easy, possibly my favorite season, 5 of 6 episodes are in my top echelon and even Future Echoes is still kinda up there]
2. Better Than Life
(sucker for the AR Game episodes, and also: only time Yvonne MacGruder actually appears instead of just being referenced)
honorable mention to Stasis Leak (love flashbacks to before the disaster) and Queeg ("April, May, June, July, And August Fool")
3. Polymorph
(Peacenik Rimmer is one of the show's greatest moments, period)
[honorable mention to Timeslides for Teen Lister calling everything crypto-fascist and for Teen Lister & Rimmer bizarrely getting along really well]
4. White Hole
(for planet pool, "What is it?" Holly's only utterance of "Smeghead", the return of Talkie Toaster)
honorable mention to Justice, for the justice field and Kryten's amazing "defense" of Rimmer.
5. Back To Reality/Quarantine TIE (again, love the AR. The attendant telling Lister that Kochanski was his Victory Condition is, I think, significant. Dr. Landstrom is one of my favorite guest villains, "Twinkle Twinkle Little Eye, Now It's Time For You To Die" should've been in my Favorite Lines post, and The Luck Virus is one of my favorite sci-fi concepts ever, Red Dwarf or otherwise)
honorable mention to Demons & Angels for Low Holly ( <3 ) and to Inquisitor for The Inquisitor
6. Of course it's really Gunmen of the Apocalypse, but everybody knows all the reasons why that one's great. So... Honorable mention to Psirens, because the scene where they catch it out because the Psiren can actually play guitar well is one of my period full stop favorite Red Dwarf scenes ever. Honorable mention #2 to Out of Time for the cliffhanger ending where Rimmer is finally heroic and shows some of his inner "Ace".
7. Stoke me a Kipper, again because AR game hijinks. Honorable Mention to Epideme, because trapping the virus in the dead arm was Annett-Kochanski's finest hour
8. Only the Good, because again, 5 star cliffhanger ending where Rimmer does something amazing (kneeing Death in the groin)
I have yet to see the modern-era content in full (i.e. 9 thru Promised Land) so no answers here yet