IHG: I like IC Strings adjacent to Shinagawa station, most convenient location.
Hilton: Conrad at Shinbashi, between Tokyo and Shinagawa stations, less convenient than IC Strings, but still along the main line.
Hyatt: The PH is in Shinjuku. If you mainly stay in Tokyo it is fine, but not convenient if you visit other cities nearby.
Marriott: RC is in Roppongi, same as Hyatt.