Good question Denver and answer is I dont know!
LOS and Tien have a feeling of home and comfort, last night my homecoming was passionate and welcoming.
PI has a feeling of naughtiness that my mum used to bash me for and I like it (not the bashing!).
Pi + good food would be almost irresistable.
Costwise PI is around 30% cheaper for drinking and food with ladies around the 'low' cost end of LOS.
Not an easy choice if I were 'Reviewee', so to speak... where next... Im open to suggestion..