1. you shouldn't be buying AF2 anyways, you should save your myth for relic upgrades

2. Tanks don't get 2 darklight rings any more than casters do, they can use a tanking ring and a dps ring - just like a caster can use a caster ring and a tanking ring

neither is optimal.

dragoons and monks are the only classes that have two proper options for darklight rings.

that's not to say that there aren't tanks running around in str jewelry, but those are the same tanks that put their attribute bonus into str/dex and have a hard time surviving titan's mountain busters