Sparadise isn't a spa.
It's a massage parlor, serene and quiet and co-ed. You check in and are brought to a room/alcove (Weho) where your massage is done. No common area outside of a waiting area where you are clothed.
Century is a Korean spa, co-ed but separate. Common areas include various hot tubs, saunas and tubs. Nude when you're on the mend or women's side, you wear clothes in the co-ed parts. Generally busy afternoons into evenings.