Cowboy.. Cheaper (a little) also more nudity usually..
Cowboy is one long pedestrian type soi unlike NEP in one enclosed one area..
Girls.. Pretty much a draw.. Always found cuties in both places though the rainbow group does have a LOT of stunners working normally. Some people have said that cowboy is more low rent.. I personally dont see it but maybe I am a low rent kinda guy
I like hanging around outside of nana in daytimes and after bars close.. I like cowboy more for a night out..