As someone who has played both Roblox and Minecraft for half of my life, here’s my opinion:
I quit Roblox, but it’s so much more fun.
Waaaayyyy more variety in games/minigames in Roblox.
Games like Jailbreak, Sharkbite, historical roleplays, and actual games coded into Roblox to name a few.
I never got bored playing Roblox.
I eventually got bored playing Minecraft.
Minecraft is overall the better GAME, but Roblox is much more fun than Minecraft ever was.
Minecraft can get repetitive, but there’s infinite games to play on Roblox.