I conducted an experiment. Equal parameters and troops, without any morale or luck bonuses, etc.
- hero on the left on the battlefield (offensive attributes) - on the right (defensive attributes)
- here you can see that the damage dealt by 2 angels is 110 for the attacker and 100 for the defender
- the beginning of the battle, the top 2 slots attack first for the attacker, the bottom 2 for the defender - the result
Conclusion: in melee combat, offensive expertise is definitely better by about 10%.