@dannythomas if you’re using tennis as a way to gain admission to top tier schools then base your decision more heavily on the major you plan to study. If HYP is better for your major and you like the course offerings and potential cohort then I’d recommend Ivy. Would your tennis experience be the same or better at HYP vs Stanford? If you get injured and can’t play tennis or tennis isn’t enjoyable for you anymore and you want to quit, your sport won’t affect your HYP aid package but it would affect Stanford’s. Just some things to think about. Lastly, envision yourself with the Stanford vs the HYP tennis teams. Which one can you see yourself getting along better with and hanging out with? Those bus rides are long 
Your choice of schools are great. I’d give the nudge to:
-HYP as far as status (imo)
-Stanford for weather
-??? for Tennis prestige (idk if this matters to you who has a better Conference reputation)
-??? for major (that’s on you to research)
-Harvard for the town Cambridge (great college town!) idk about YP
- Any one of the schools for job and career assistance (although the Harvard name is bar none the best, imo)
-If you like a smaller student body size, then really consider HYP as the campus would have a more intimate feel vs Stanford’s sprawling campus at 16k students (combined).
Good luck!