Basically DayZ and rust, to the VERY ABSOLUTE CORE, are the exact same thing.
-Survival against wild
-survival against other players
-bandits are prominent
-so are assholes
-Everyone wants everything
-everyone is hostile
-You’re a sitting duck until you grab a gun
-just because you have the high powered rifle and full armor, doesn’t mean the guy with the pistol can’t take you down.
-Complaining in chat will give you a “QQ, welcome to (insert game here)” based message.
-DayZ has a big ass map with all sorts of landmarks, rust has a fairly large map with mostly open and natural terrain areas
-In DayZ, you camp a room and hope no one “invents” stealthing. In rust, you build a house, sit on the top with a can of cola and wait for an unlucky guy with a gun to cross your sights, that or get shot clean off your new roof.
-In DayZ, you raid by running through buildings seeing if anyone is hold up in it. In rust, you run around looking for a huge tower that doesn’t have stairs going up along it in an attempt to find a base you can blow up and take the contents from.
-In DayZ, you will be shot from a mile away by a trained and veteran player who possesses a high powered rifle, who likely had a spotter. In rust, you will be sniped a quarter mile away by a guy who just bought the game and found a pistol, who has no idea what the fuck he’s doing.
-In DayZ, if you die, you loose your stuff. In rust, if you die, you loose your stuff, and most likely your base if you’re being raided.
-In DayZ, if you’re being raided, they will take your shit and either move into the base or run off. In rust, they will kill you, take your shit, kill you when you respawn, and maybe fuck with your base a little bit.
-In DayZ, if you’re slow at killing an enemy, you die. In rust, they will trap you in their room and treat you like a prisoner, until you give up and suicide, that or they get tired of waiting, get stupid, and try and lure you out. In which case you bolt for it and blast them in the face with a shotgun.
-In DayZ, they will bitch for being killed by zombies. In rust, they will bitch for being killed by wolves.
-In DayZ, if a zombie kills you, it’s normal. In rust, if a zombie kills you, you were AFK.
-In DayZ, if you are in a group, they will kill you if you are a liability. In rust, they can’t because you have access to half of the house.
In conclusion: Rust is better, mostly because of the fact that you’re fighting against real people, not NPCs half the time. The assholes are everywhere in both games, and rust just has a more survival approach to it then a survivalist approach. Really, in the end it’s preference. But I prefer rust because I can craft my M4 instead of having to spend hours looking for one, getting killed multiple times in the process.