The junior suites comprise both the Studio Suite and the King Suite. For the difference between the 2, see post
#140 . Both are exactly the same size. The King Suite is priced just slightly higher than the Studio Suite. A TSU books into the Studio Suite.
The rate difference between the King Room (38 m2) and either of the Junior Suites (76 m2) is pretty minimal considering the 2x difference in space, but whether even that difference is worth it for just one person is a subjective decision.