Personally I've never liked DayZ. It is nothing more than a poorly optimized mod. H1Z1 looks to change the landscape and give us a proper zombie survival experience.
Starting in the game's 64-square-kilometer world, you have little more than a fire ax and basic gear, and you must contend with the zombies that stalk the landscape in addition to your health, hunger, stamina and thirst.
The features you'd expect as first class citizens. I'm quite thrilled about this title as I've also enjoyed Planetside 2.