Which game is better Day Z or Rust?

It depends on if you like the idea of zombies being round corners there to jumpscare you. Also if you like the idea of being in a modern era or a prehistoric era. The developers of Rust have removed zombies and replace them with wild bears. Also the game is set in the cavemen times. DayZ however is set in the modern era with advanced weapons and includes banditry. I don't think it has a way of building forts and outposts whereas Rust has quite an interesting building mechanism. Hope that helped.

Good luck in choosing which game you wish to play.

I personally prefer DayZ, but Rust is a good game. Rust is more of an arcade survival, and is kind of similar to Minecraft (build/craft items, collect resources, etc.). DayZ is more of a simulator, and is extremely realistic. The only thing about getting Rust over DayZ is that Rust is being re-made by the developers, so when the remake comes out the original might be pretty empty. DayZ on the other hand is being worked on and updated all the time.