I began playing RPGs back in 1977 when the Holmes Blue Box Basic came out. We played many other TSR RPGs that existed & new ones as they came out.
We also dabbled at least once in several other non-TSR RPGs.
I've played even more since 2014 when I attended cons regularly.
Since D&D was my first RPG, it sort of defined what an RPG was and hit harder than all the others. I was more of a science fiction fan back then, but still played more AD&D than any other RPG.
I still run and play older versions of D&D. However, I will run more non-WOTC games in the future.