Plan to go to Japan

Let me explain this for you to choose which is your better choice.

Grading.
Century Hyatt: 5 Stars
Century Southern Tower: 4 Stars

Distance to JR Shinjuku Station:
Century Hyatt: 20 mins (hotel provides free schedule shttle bus between JR staiton and Hotel)
Century Southern Tower: 3 mins

Distance to Subway Station:
Century Hyatt: 3 mins to Tochomae Station
Century Southern Tower: 1 mins Shinjuku Station

Distance to Airport Limousine Bus Stop:
Century Hyatt: Hotel Entrance
Century Southern Tower: Hotel Entrance

Room Size:
Century Hyatt: 30 Square Meters
Century Southern Tower: 26 Square Meters

Location:
Century Hyatt: Near The Tokyo Metropolitan Government
Century Southern Tower: Near JR station, many shopping arcade beside it

I think Hong Kong Traveller will choose Century Southern Tower, because it's easy access from Shinjuku Station to other area in Tokyo, the room size and facilities isn't a big differnece.

Hope this experience can help you to found a good choice.

Century Southern Tower Hotel

Near JR Station

The main lobby is on the 20F, before you arrive the lobby, you can take the glass elevator to see the view of Shinjuku

The room is comfort

http://www.southerntower.co.jp/english/index.html

Century Southern Tower Hotel is good!!!!!!!!!!