I started with Red Box D&D, and it was pretty much the only RPG available in a small provincial town in the North of England at the time. Went all the way through to Immortals, though we never really played those rules and instead switched over to AD&D 1e. I also got into Dragon Warriors shortly after that, and we played the hell out of that system. When I went to college and made new gaming friends we got pulled back into AD&D as our primary system but also played Call of Cthulhu and some WFRP.
We moved away from AD&D after playing a little 2e, finding the game pretty restrictive for our wants at the time. Rolemaster became our fantasy system of choice (with MERP as the on-ramp) and we played some serious campaigns using that system. I got into GURPS around this time, and it became my system of choice for a good few years. There was some Space Master and some WEG Star Wars as well.
3e pulled us back in, and about this time I made some new gaming buddies (my cousin married a gamer and he plus another got added in to our long-term group) who were big on D&D so we stuck with that pretty much through 3.x and on to 4e. We enjoyed 4e and played a big chunk of that, too, before getting disillusioned with the maths (this was before the fixes in the Essentials lines came out) and moving away to 13th Age, before coming back to 5e.
I’ve never been a big fan of D&D since Dragon Warriors and Rolemaster, but my gaming buddies enjoy it so I regularly get pulled back in. I prefer more flexibility and like to game in different genres so GURPS became a big thing for me. GURPS proved a little too ‘fiddly’ for regular play so I kept looking and eventually found Savage Worlds as a sweet spot for what I wanted, so that is my game of choice.
But I know I’ll end up playing the next iteration of D&D because it’s pretty much guaranteed that one of the GMs* in my group will want to run it.
* I’m lucky, my stable group of seven includes people I have been gaming with over 40 years and has 4-5 rotating GMs.