IF you are wildshaped you are not wearing armor since what you are wearing (armor) before you shape is transformed and is part of your new form and not armor after you shape.Huh? Defense Fighting Style says: "While you are wearing armor, you gain a +1 bonus to AC." So what's the question about whether or not it can be used with Wildshape? Get armor on your Druid, you can use it. No armor, you can't.
I honestly think generally the best beast to wildshape into is usually the snapping turtle because of the relatively high AC. I think that will generally work better than an Ape or T-Rex at the levels they are available.
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