I hope it is not too late for me to reply ur msg as i am quite busy.
Well so far that i know long before even SIM existed and offered UOL program, It was Stansfield the most prominent UOL tuition provider in Singapore.
They used to have great lectures such as Allan, Steven McDermot, Rhada etc however after they moved to Penang lane they become SUPER SUCKs.
Most of their former lectures have moved to SAA which is good.
The lectures i know are Alan, Teo, Rhada, Raju.
They are very dedicated lectures.
I have completed my UOL program with Stansfield. That's why i get to know all of these.
My brother however will transfer to SAA this August intake.
I heard that they have 10% discount, but i think u have missed the deadline.
Anyway money wise SAA is still lower compared to SIM and their location is good, at least for me

The SAA UOL campus will be in Raffles Place area, it will be just walking distance from raffles Place MRT.
Well they defenetely do not offer u compund premises like SIM but i think the premises is quite ok to support ur study process.
Anyway i think the most important aspect is the lectures n their notes.
I hope this will help.