As others have said. Minecraft is the more known and established. Luanti is awesome though. It can do "Minecraft" and so much more. I'd say it really comes down to external factors.
Do your friends already play Minecraft. And if the don't, are they going to have money to put towards it? In the end there's nothing saying you can't do both. I will say this though. Installing and running a dedicated server for Minecraft, bedrock at least. Was way harder than luanti. But if you aren't planning on self hosting then you don't have to worry about that.