The best class setup in Call of Duty Advanced Warfare has to include an assault rifle due to the layout of the maps. The best assault rifle in Call of Duty Advanced Warfare is the HBRa3, although the AK12 is a very close second place. A lot of people run UAVs in Advanced Warfare which will show you on the mini map. Also, using the double jump of the Exo Suit makes you show up on the mini map.
The HBRa3 Assault Rifle in Call of Duty Advanced Warfare is the best handling assault rifle in the game. The first 3 rounds after you start firing have a much higher fire rate than normal. It has a low fire rate but high damage so it is best suited for medium range, fast paced combat.
The ARX-160 assault rifle in Call of Duty Advanced Warfare has the most range of all the assault rifles and is a 3 round burst weapon. It is best suited for medium to long range in a defensive position.
The Bal-27 assault rifle is a medium range weapon with good all around stats. When you are using the Bal-27 don’t be too aggressive since most submachine guns will beat you easily at close range.