Dr Lisa Chin at Gleneagles comes up a lot as a solid choice, she's been around for a good while and quite a few mums I know have delivered with her, some even going back for their second child, which says something. Dr Chia Yin Nin is another name that gets mentioned, especially for general gynaecological concerns beyond just delivery. A colleague of mine also had good things to say about Dr Hong Sze Ching, though she splits her time between Gleneagles and Mount Alvernia, so worth checking her current schedule before you commit. Overall I'd say the key is finding someone whose communication style suits you, experienced doctors are one thing, but feeling comfortable enough to ask all your questions matters just as much during pregnancy.