My wife was born in Argentina and we go down there once every 18 months or so. Her family doesn't live in Buenos Aires, so my experience is limited; I've played Olivos and Buenos Aires GC, but not the Jockey Club. As between Olivos and BAGC and strictly based on the courses, I have a slight preference for the better two nines at Olivos (can't remember which they are). BAGC, while fun, feels very American to me--in fact, the whole place feels a lot like walking into a CCFAD. Olivos, on the other hand, has a much older, traditional, and unique feel--both the course and the muni-style clubhouse, pro shop, starter, etc. So I would give a slight recommendation to Olivos based solely on the golf, but if you're looking for a unique experience, I would strongly recommend Olivos -- it's just a lot different from what we're used to in the U.S.