Congradulations! Regarding your question, I agreed that I can't compare the three named doctors since I only have expereince with Dr. Kong Man Yee. So, I would share my experience with you. Hopefully it would be helpful.
1) Dr. Kong is nice. She has been my Gynae Dr. even before my preganancy for my annual Gynae body check
2) She was patient and answered my questions comprehensively. During the ultrasound, she was pleased to explain the pictures for me as I have difficulty to orientate them
3) She was so honest. I was confirmed as a GDM Mum at my 8th month pregnancy by PWH. Since I had many check ups in PWH, she advised me to stay with them if I choose to have delivery in PWH. Certainly, I can still stay with Dr. Kong for continuous monitoring if I need to.
4) I think the shortcomings are:
a) Need to wait for more than 1 month if you are a new patient and plan to have your appointment on Saturdays or after business hour. If you choose to have an appointment during weekdays, it's a lot better
b) Always need to wait for 1.5 hours even you have an apppointment. So I usually go to other places e.g. Wing On or somewhere else.