All of them were very fun but if I played gta v before the others I probably wouldn't be able to get into them with the exception of San andreas

I've only thoroughly played
4
(and
The Lost
and
The Ballad
) and
5
(and
Online
up to version 1.27). You won't like the vehicle physics of
4
if you've been sufficiently exposed to
5
, but honestly the distinction isn't so terrible except for how the topic pertains to motorcycles.
I played a very small bit of
Vice City
, back in the day, and it was fun, so in theory,
San Andreas
should also be fun, but surely a ton of convenient features and complexities will be missing in these old games.