Battle Online: Survival Island vs Starve.io
Battle Online: Survival Island
Battle Online: Survival Island is an early access battle royale game where you have to fight against other players to survive in a gradually shrinking map. Each map in the game can house up to 15 players at a time while providing players with a ton of resources that are stored in wooden crates to pick up and collect. There isn't any crafting or base building though - just some first person shooting. You cannot loot the corpse of a player you've killed either.Granted that Battle Online: Survival Island still has a very long way to go to be remotely comparable to PUBG, this game is still pretty fun in its rudeimentary kind of way. Not to mention, by playing the game and giving the developer some feedback, you can actually help the dev turn this game into a much better mobile battle royale game for you to enjoy.
Starve.io
Starve.io is a unique IO game mainly because it is more of a base-building and survival game rather than just a hack-and-slash arena. In this game, you will need to collect resources and turn them into useful items which will marginally improve your chances of survival. The crafting aspect of the game is very much simplified but it can still take you a while to figure out crucial crafting details like how much resources you need to create a certain item. Also, a quick tip if you will - grab as much food and wood as you can at the get-go.As a survival game, there are several important "meters" that you will need to keep an eye on, such as temperature and hydration. Hunger also something that you will need to frequently deal with, aside from other potentially hostile players as well as other monsters like vampires and zombies if you happen to play its other game modes. There is even a "hunger games" version which frankly feels a lot like a battle royale game.
Unlike many other IO games where players are always pitted against one another, Starve.io is a game in which you can actually choose to coexist with other players rather than just swinging whatever weapon you have in hand at anyone you see... though, many players still do that pretty often, especially those better-equipped ones.