why is the question even being asked? Garry's mod you can build absolutely anything to your hearts content... with Minecraft you can only build with blocks and you cant build absolutely anything. Plus, look at the pricing Garry's mod- $10 Minecraft- $27 Garry's mod you can do more for a lower price while with Minecraft you can do LESS for a BIGGER price. Plus there is a mod to put Minecraft in Garry's mod. Whoever voted for Minecraft, you've obviously never played Garry's mod.
Minecraft-themed gmod map.
This is a simple way to be social. You don't even need internet to play minecraft