Rust vs Wurm Online
Rust
Rust is hardcore survival game where the only aim for every player in the game is to survive. Being a survival game, your character will have needs that you'll need to fulfill or risk getting ill or worse... dying from it. There are tons of recipes for you to craft a wide variety of items from as long as you've got the resources you need, and you can also hunt and built a shelter.As fun as this game may sound, the community in this game can be a bit toxic. Most players have a kill-on-sight policy (even if you're naked and literally have nothing with you) and this means playing alone can be very frustrating. If you're planning to play this game, you might want to get a larger group of friends - maybe somewhere around 5 or more players - or you'll quickly realize you want your money back now.
Wurm Online
Wurm Online is a unique sandbox/adventure RPG that many has been touting as being the most realistic one ever. The game is not a solo survival game unlike Minecraft. Instead, you are given the opportunity to build your own settlement - literally from the ground up - and help it to grow. Being an MMO, you can enlist the help of other players to develop your settlement from being little more than a camp with a few shabby and lopsided huts into something that passing bandits might be eyeing hungrily at.There is also an adventure element in this game where you get to venture of into the wilderness to fight a variety of creatures to earn some loot and to level up. Players who enjoy clashing swords with their fellow players can even hop into a PvP world server to enjoy some open world PvP. That said, things will go by a bit slowly if you are playing the game alone though. Wurm Online is an MMO for a reason!
The game has nothing but a fun and great experience to offer to its players and best yet, it's free to play! You can opt for a premium membership if you like just so you can play on multiple servers but, as mentioned, the game can be enjoyed without having to spend a cent.