Replying to Cuba VS. Cancun

A few friends and I are planning a trip down south next winter. Call us what you want be we're going for the typical spring break party deal, no we aren't jockotrons we just think it would be dope. So the dilemma is that we originally wanted to hit up Cancun, then a bunch of girls we know told us they're going to Cuba. Going with these chicas isn't a big deal for me (it sort of is for a few friends), the thing is Cuba could save us each over 500$ probably and we'd get a nicer hotel/resort. However, it seems like Cuba is hype and all, but Cancun is really next level. Anyways, hit me up with some opinions/experiences to help out with the decision. Thanks NS.

SPARKNOTES: Going south next winter around spring break, Cuba or Cancun? Go!

P.S. Is the drinking age in these resort areas (hotels and bars) 18+ or 21+? I know a lot of Americans go there so they could boost the legal age.