Congratulations! Stanford and Williams are two different schools. If one were an ideal fit for Stanford, that person may not necessarily be an ideal fit for Williams. I assume if you applied REA to Stanford, Stanford is your top choice. If so, then why would you select a DI, Power Five, 7,000 strong, top research university on the California coast then later try to opt into a DIII, NESCAC, 2,000 strong, top LAC, in the Berkshire Mountains? It’s like saying my favorite ice cream is Blue Bell Vanilla, err no it’s Blue Bell Chocolate. Assuming you are not schizophrenic (and, it’s not money because financial aid based on need should be the same at both schools), you must be collecting trophies. Both schools accept academically talented applicants. Ultimately, acceptance at both schools boils down to fit once the academic minimum standards are met.