Both, but I have found over last twenty years what I like has become niche. JRPGs in late 90s were fairly popular, now they are very niche, same with plat formers. Shooters weren't big on consoles in the 90s (well, Goldeneye...) but now have become a major genre. Never really let tastes get caught up with what people are buying.

Popular games. I've never really liked niche games, and now I've become more of a casual gamer and mainly just play online multiplayer games like Halo, COD,  and Mario Kart.

I also find paradoxes to be great as well. 

I'm into a bit of both, popular games like Planetside 2 and niche games like planetary Annihilation, hell most RTS games these days are niche since the genre is practically dead and nowhere near as popular today as shooters and RPG's.

I'm all for Niche. Well...Japanese Niche anyway. Well...it's hard to explain. Games like Dragon Quest or Y's are considered Niche in the US but in Japan they're popular games. So as a westerner, I like whatever isn't western I guess. I blame Nintendo.

Depends. Is Nintendo niche or popular? I'd say it's right in between.

Popular for me because I enjoy those kinds of games while I don't have an interest in JRPG's.

I never choose a game because it's niche or popular. I just play the games that interest me. I play a mix of both.

This.  I'm just like this.

I'll play any game that looks fun, regardless of whether it's popular or niche.

That said, popular or mainstream titles have a tendency to be abused/milked/creatively stifled by publishers requiring big returns, so I'd lean slightly towards niche.