I mean, depends on what you're talking about on the handful of games, some of them you can't even call a game, they're just pure trash while some have effort put into them.
I mean, private servers in games exist. Tbh Minecraft is just one game, and I get bored of a game is usually a few months, so Roblox is better to play continuously for a long time, seeing as I downloaded Minecraft and had a great time for 3 months, but have had Roblox for 5 years, they're both nice, but I can play Roblox for an extended period of time.
uh, more things than a survival game? not by much but yeah Minecraft is better for a single game, Roblox is better as a platform as a whole, I wouldn't say that Minecraft has everything Roblox does but I did have a good time playing it