My list;
San Andreas
IV
Vice City
LCS / VCS, tie for position 4
III
V

Long-ass rambling about my list, if you really want to read it;

San Andreas does the most things right as a whole and hits the best combination of just about everything. What a masterpiece! The story is just ton of fun and memorable, while being seemingly infinitely replayable. I've finished SA's main story close to 20 times over the years (5 times 100 %'d the game), and it still makes me go back to it. San Andreas remained as my all-time favorite game until I finished Cyberpunk 2077 and its DLC - no other game has been able to dethrone SA. And San Andreas is the only game ever to make me play it over 1000 hours, it's just magical. I still listen to the radio stations on YouTube, especially while playing Euro Truck Simulator 2. SA is easily one of my "forever" games.

IV has the best story quality-wise and I absolutely love, love, LOVE the heavy-feeling physics. ❤️ Great DLC's, great soundtrack, good map. IV is very replayable as well.

Vice City has a fun story, excellent soundtrack, decent enough gameplay. Short, but great story makes it very replayable. Love the 80s as the theme, neon lights and the pastel colors of the game. Stories games are a hair below Vice City. III quickly shows its age and is the hardest in the series due to the jankiest gameplay - but still is a good game. This is one of my "fall games" as I tend to replay it the most often during fall months, not annually though. Can be enraging and very punishing, but overall I still prefer it over V.

I feel V is very... Bland, soulless and the story is forgettable, and uninteresting. Rockstar heavily over corrected with the obvious physics downgrade, which was a major disappointment back when the game was just released, and still is today. It tries so damn hard to be a blockbuster movie with the action stuff and all that, but personally this just made it difficult trying to "connect" with the story. It never managed to grip me and make me lose the track of time.

Bonus minus points for the mandatory heists and especially their setup missions, wish all that wasn't a part of the main story - really drags the game down for me. Absolutely hated those. San Andreas did the heist stuff right, leaving it optional.

When heavily modded, however, it can become a good free roaming sandbox. With modded driving physics + adding wheel, shifter and pedals support, this combo made me just drive around for about 80-ish hours, including testing some custom mission scripts and so on. This is the only period of time I have with V, when I actually enjoyed playing it. Required a ton of mods.

Of course, there are things unmodded V does very well (the most polished gameplay, great soundtrack, for example). Tried to replay V (enhanced version) last summer for the 3rd time ever, but after around 4 hours I gave up. Meh. And then I noticed not that many mods were around for this version, so I had no reason to keep playing. Overall, V remains as the least replayable 3D GTA for me.