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As a leading "ride gravel bike inappropriately" contender, I'd say carbon for sure. Rock gardens, baby head stream crossings, deep rail road ballast.. carbon just bounces stuff off with no damage, aluminum gets dinged and bent up. After 10,000+ abusive miles, the carbon rims are scratched up but still rocking.
Also make sure you're running tires about 1 cm wider than your rim OD, that will help protect the rims.
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