Actually when it comes to room pricing,Gideon is cheaper than Fomosa by S$10. The thing is Fomosa is close to most joints,therefore save more on transport.
Both has shopping mall nearby. For me,i don't take their breakfast but room wise,Gideon has better room,stronger air-con and 4 pillows. Fomosa air com is weak,i perspire a lot during my stay there and it has 3 pillows and a small sofa cushion comparing with Gideon's 4 big pillows.
I like formosa becos they have the special type of room that i want,and unless the type of rooms i want are out,i will take Gideon.
Below is price comparison from booking.com :