To answer my own question, the 41mm is .55mm thinner, has a smaller battery but the same runtime (allegedly...), double the internal memory, and only a slightly worse pixel count (390x390 vs 400x400) which means a higher ppi.
Impressive...
The PPI is the most stand out thing about the watch. That and usability/performance.
@Stonehedge started
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To answer my own question, the 41mm is .55mm thinner, has a smaller battery but the same runtime (allegedly...), double the internal memory, and only a slightly worse pixel count (390x390 vs 400x400) which means a higher ppi.
Impressive...