All metal is not created equally. Compressed, powdered aluminum doesn't have much ability to absorb impact and rebound. Thus it would likely crack long before a plastic trigger guard with modern firearm grade polymers.
That being said, I own and have owned 870's with both types of trigger guard and I've hauled them through the woods and up and down trees and I've even dropped one once or twice. I've never broken a trigger guard of either description, though I'm sure in the history of the 870 it's happened somewhere.
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