Definitely Bliss SPA at W is too expensive and nothing compared to 4 seasons and Ritz. The area is little, there is a small pull and not all the facilities such as steam room, sauna, jacuzzi and other lovely area.
Sorry for whom believe W is cool. It'a just a building in the middle of the noise and sands. Plus it's much expensive the 4 season. That 4 me remain the best in Doha. Without any doubt.

P.s.
I just know the man areas.....