I'm a little bias because i love the Venetian and all it's amenities.  Tao is still always crowded so get there early.  If you are staying at the hotel, ask the concierge to put you on the guest list.  They will either set you up with a promoter to walk you right in or at least put you in the line that's not nearly as long as general admission.  The drinks are slightly higher then other Vegas clubs.  The restroom doors for the girls is really cool, it's transparent but when you lock the door it turns opaque.  Music is usually good in both rooms.  Nice decor and there is always the appeal of the many naked women lying around in the tubs and canopy beds for the boys.