OP, funnily enough I know a young woman making the exact same decision as you! (Harvard SCEA vs. Stanford RD)
You basically can’t go wrong, so I would really concentrate on fit. In terms of campus vibe and location, Stanford and Harvard are pretty opposite. I mean, Boston (Cambridge) vs. NorCal (Palo Alto)… two very different places and lifestyles. Soooo do you want to go to Stanford with warm(er) weather, the Cali attitude (chill!) with Palo Alto as your local town (it’s adorable but expensive)? Or do you want to do the Boston experience–the architecture, the snow, a city with a median age of 25 and 5+ major colleges right in your backyard? Do you want to be a train ride away from San Francisco or New York City? Where do you see yourself?