In general (and there are more products coming out all the time that blur the line even more):
I wouldn't get hung up on the names, they will both achieve protection to the finish, though sealants are in general more durable and longer lasting while waxes in general may make the paint pop more or look "deeper". Depends on what you're going for.
2013.5 VW GLI
2013 Nissan Xterra Pro-4X