ROBLOX=Millions of alternative/deactivated/banned/hacked accounts,horrible community,trolls,hackers,spammers(in the commentary)and roblox does not live up to the games name "Ro-BLOCKS". Why,you ask? IT HAS SPHERES! It is really turning into a MMO-RPG instead of a Building MMO game.
Minecraft=I know there are alt accounts,but i dont see too much,some hacked accounts yes,the community is GREAT and FRIENDLY. But servers are hard to make. You can build ANYTHING in creative and challenge yourself on survival. You have to survive,while roblox's ROBLOX Studio gives you all the materials ready,so its far more boring.
And conclusion,most ROBLOX users,like myself(I dont really,or perhaps I DONT play roblox anymore,or..idk!)are attracted by minecraft via:Community,popularity,difficulty(for hardcore gamers)and a bunch of different stuff.
What I like more? Wel.....to be honest,I like minecraft more but I say niether!