Both weapons are good for CQC, while the AKS is meant for short and mid range combat the M4 is meant for more mid and long range fights but can also handle most close fights cuz of the fire rate and damage per round
get a custom curser PROS: Best VISUAL recoil controller, never dissapears from the the middle of the screen, makes it really easy to tell were you're shooting and shooting from. CONS: not having a curser ( curser V2 install is PLEASE ) is the worst mistake