This really depends on what kind of experience you are interested in.
If you want the party vibe then the Hideaway is most likely your best bet....but the food is marginal. If you are looking for a more sedate and upgraded experience, the Beach Club is what you want.
This time of year, the heated pool at Hideaway isn't going to make much of a difference. In the winter/early spring, I would say the heated pool would be a factor, but probably not right now.
If money is no object I would definitely say to go with the Beach Club just for the far superior food but if all you really want is a loud DJ and a beach/pool lounger and "no kids" is a big deal, then the Hideaway will work.
Personally, I wouldn't spend money on either of them but that's just me.