So, I was thinking: AC bonus aside, is there any mechanical reason to take the Dual Wielder feat instead of Polearm Master?

(If your response to this is "Because you want to play a dual wielder and you should only care about concept and not mechanics"... well, post that if you must, but don't expect a response, at least from me. I'm interested in mechanical balance here.)

For a character with Extra Attack, the damage dice are the same: 3d8 for Dual Wielder, 2d10+1d4 for Polearm Mastery, both averaging 13.5. However:

Advantages of Polearm Master

• Adds your stat bonus to the "off-hand" attack.
• All but one of your attacks is made with reach.
• Free opportunity attack when a foe enters your reach.
• Can be used with Great Weapon Master.
• Front-loads your damage into your "main-hand" attack, so if you need to use your bonus action for something else, you don't sacrifice as much damage output.
• You only need one magic weapon to boost all of your attacks.

Advantages of Dual WielderAm I missing something here? I mean, I know Polearm Master is a powerhouse feat and Dual Wielder... isn't, but this seems really extreme.

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