Hello Yvonne,
Personally, I prefer GPCH as the ballroom is pillarless & the reception area is very exclusive. The facade of the building & the dishes are presentable in my opinion. GPCH is also easily accessible. However, some people would mind the foreign workers gathering around the area.
The building of PR looks quite run down & it's not really accessible by mrt, unless your guests walk at least 15 minutes from Lavender mrt station. If I am not wrong, the food is prepared by SiChuanDouHua, so the standard will not be too bad.