Jordan, you will have a good time at both places. On my first 2 trips, I stayed at SL the whole trip and on my recent one on memorial day weekend I stayed at HLH the whole time. Good variety of chicas at both locations. The SL has a big bar with a big menu and is open later than HLH, so as a idea you can go to the SL and continue partying after HLH closes and stuff.
May I suggest this shuttle bus that many other mongers use as a way to get to the SL directly from the airport, or contacting fellow CRT member Puravidatransport, who offers a private car service between the airport and the gulch for good prices. It all depends on what your taste is.
http://www.shuttlebus.co.cr/index.phpwww.puravidatransport.com