Moderator, El Al and Marriott Bonvoy, FlyerTalk Evangelist
Join Date: Feb 2005
Location: SIN
Programs: SQ*G, Mar LTT, Hyatt Glb, AA LTG, LY, HH, IC, BA, DL, UA SLV
Posts: 12,018
The four points would not be good for trains to the airport. The Westin is slightly closer on the blue line than the Sheraton. The Courtyard is one stop from the Sheraton albeit on a different line.
What at do you plan on doing in Singapore? Have you been before?