Congratulations on your acceptance to Emory! My son is on the main campus, so I don’t have Oxford-specific knowledge. I think that the main campus has a broader course selection. Anecdotally, he has always gotten the courses he wanted, although it sometimes involved emailing a professor or being on a waitlist until the add/drop/swap period. I did see that Oxford students protested lack of course offerings this fall and university responded. There is also an excellent pre-health advising center located on the main campus, but I’m sure you could access those resources from either campus.
Clearly the pre-med track is very demanding academically. Being on a varsity sports team is a wonderful opportunity, and I’m not sure how time-consuming the basketball team would be, so balancing both is something to consider. As @cinnamon1212 said, only you can weigh these factors but you have great options either way.