The M4A4's official description in CS:GO says the following: “ More accurate but less damaging than its AK-47 counterpart, the M4A4 is the full-auto assault rifle of choice for CTs." M4A4 is an ...

The M4A4 definitely has the upper hand over the AUG due to its overall usage. This is despite the fact that the AUG has some better stats in terms of bullet penetration, movement penalty, and more.