Stanford: Sell it before build it (sometimes fake it)
MIT: Build it before sell it (may come late to the market).
But AI changed the whole game.
S overall still has a stronger campus-wide startup culture than M, although both are among the strongest in the US and around the world.
Also, S is a much larger school than M (17000 students vs 11000). So, while S produces more funded startups overall, S & M have similar per capita startup production normalized by student population.
Both S and M, plus H, and Berkeley are among the best places for future entrepreneurs (Wharton/Penn is also pretty solid, especially outside Tech).