What are the advantages a fighter/champion has over a barbarian/berserker? [on hold]

Both the fighter and barbarian are using a two-handed weapon build. I’m asking for the pros a fighter may have in combat over the barbarian because it feels like in combat the barbarian is superior. Things like number of attacks, AC, damage, etc.

So what advantages, if any, does a fighter/champion have over a barbarian/berserker?