Leather - ultimate protection from abrasion IF the fit is very good.
Textiles - trumps leather for convenience, air flow, and can add all-in-one water resistance. Yearly weight gain/loss doesn't impact textile function the way it can proper fitting leather.
There's only one textile approved for road racing use - Motoport Kevlar.
Motoport's kevlar is a "special case" in that it can substantively be repaired thus making it 100% restorable. In fact they guarantee that any crash that deems their gear un-repairable will be replaced for free.
For touring, especially if the junctions between convenient services was more than a few days . . . textiles all the way. Leather's sole practical ace, abrasion resistance, is undermined by the lack of comfort from such a close fit (no airflow) and the reality that for many "adventure" riders abrasion is probably second to outright impact threats. While the armor in leather CAN stay in place better than in textiles, due to the close fit, it is otherwise not superior.
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Orange, it's the new black.
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