@DkJoe2
I haven't used either regularly enough to compare.
The main difference would be the acetyl group in aspirin which permanently inhibits the COX enzyme, and aspirins acidic ph (can be buffered with sodium bicarbonate). Wintergreen is potentially more similar to sodium salicylate I'd say?
Aspirin acts as an acetylating agent where an acetyl group is covalently attached to a serine residue in the active site of the COX enzyme