The primary school admission talk is very well organized. The school, or its principal, is very ambitious or even aggressive to show the strengths of the school and its students. All these make the school very attractive. In fact, most parents rank YWPS very high among all the DSS / private schools.
I can't feel the same for YWC. To be honest, it's a bit boring to me.
This is just my personal feeling. I would suggest prospective YWPS parents attending the admission talk of YWC as well and try to learn more about the secondary school. For a thru train DSS school, I believe you should consider the whole 12 years education together instead of just looking at the primary school.