Bullet Strike: Battlegrounds
This list isn't in any particular order, although we think Rules of Survival is one of the best. Second on the list though, is Bullet Strike: Battlegrounds. And as you guessed it by the name, it's all about the crazy battlegrounds.
In Bullet Strike, you get dropped on a deserted island with up to 20 players, and the last man standing wins. No matter how he wins. Bullet has some of the best 3D graphics for mobile, a huge arsenal of weapons, supply drops, attachments, and basically everything else you'd expect from a PUBG alternative.
The placement of the controls for this type of game, on a touchscreen, is one of its best assets. That's hugely important in any FPS game.
This is one of the best battle royale games we've seen for Android.