PUBG Mobile Tier List are tricky because the best weapons tend to be the ones you practice the most, and some weapons are better than others depending on the situation.
So the Uzi is one of the highest rate of fire SMGs in the game, and great for close range when shooting solo, but if they have friends, you can reload often, slower rate of fire but with a big Magazine like The Bizon means shooting needs to be more accurate, but you can take on multiple opponents and possibly catch *them* to reload.
Take the AWM, which is the only gun that can hit full health at once, and the Lvl 3 Helm, which is clearly the best bolt action. Each benefits from a different type of playstyle.