Pool-Minecraft or roblox?

It's poll, not pool.

Roblox. Never played it but I can't stand mine craft.

It depends. If you like playing games more, and you like a sandbox game where you can make anything within the game, Minecraft is the way to go. If you like making games, and want to use a game development platform to make anything, ROBLOX is the way to go. Overall, they're not comparable. One is a game, one is a game developing engine. You can potentially make Minecraft on ROBLOX, it's just against the rules due to copyright.

If you want to learn more about creating ROBLOX games, "ROBLOX Building Guide", available on Amazon, shows you how, along with a chapter on the differences and similarities between ROBLOX and Minecraft!