I always play single player. I ocasionally play local multiplayer. I never play online.

With that said, it's a matter of genres and what the developer wants.

Singleplayer any day.

Games where I like multiplayer are rare and I usually only like local multiplayer. Games where I like online multiplayer are even more rare, basically only Mario Kart with some of you guys. Maybe some Call of Duty 1 on PC with a friend of mine but that's only once in a blue moon anyway.

Singleplayer. I like RPGs where I have time to think. Moreover, up until now, in the last 16 years my internet connection speed grew a lot, but its lag remained quite high, too high for many online multiplayer games. Local multiplayer on PC is good, but you need one PC per player in most cases, not very practical in most cases, except LAN parties; on consoles it's far simpler, as they are designed to accept many players at once without input slowdown problems, and anyway very few PC games are designed for local multi on the same machine. When I was a console gamer, with the Intellivision, I enjoyed local multiplayer.

Pre-dominantly single player for me. I buy too many titles to get too invested in multi-player and when I do give it a go I normally don't have the time to get to a decent skill level in any one game.

The only memorable mp games are the only mp games. Definitely single player