The proper selection of equipment is very important in Call of Duty: Mobile. This page contains information on how to choose equipment based on the way you play.
If you prefer limited contact with your opponent and like to fight at a distance, you should equip the appropriate weapons. If you want to play this way, your only choice at the beginning of the game is DL Q33. Over time, you will gain access to other sniper rifles. A good choice is the M21 EBR - it is a compromise between the rate of fire, accuracy and damage. As for additional weapons, they give you more freedom. The only thing you should avoid are rocket launchers.
It is also good to choose the right perks. The best perks suited for this play style are Skulker, Ghost and Dead Silence. Thanks to them, the enemy will have trouble determining your location.
Aggressive (close range)
If you want to specialize in close-range combat, you must arm yourself with weapons that deal huge damage but aren't necessarily effective at long range. Initially, the best choice is BY15. It is characterized by a low rate of fire, so as soon as the AKS-74U is unlocked, switch to that weapon. As for additional weapons, avoid rocket launchers.
The best perks are Fast Recover, Vulture and Tactical Mask.
Passive (fight on a medium distance)
If you prefer to fight at medium range while using covers instead of rushing at enemies, then you should be happy with the number of options here. As your primary weapon, you can choose any type of weapon that is characterized by moderate range, accuracy and damage. This weapon should have high rate of fire. M4 is one of the better choices. As for additional weapons, the only bad choice is a knife.
Choose the following perks - Fast Recover, Tracker, Alert.