Firsts of all congrats at being a soon to be mommy!! I think it has to do with your individual preference if you want a female or male Gynae. For me I am a very modest person in the since I would not want another gentleman to see my lady parts. So I went with a female gynae. Although I have heard from friends sometimes its hard to choose a female gynae as its hard to find one you connect with.
In the east there are a few Gynae. Of course you should also consider what hospital you want to deliver in. Some Dr's can deliver one hospital but not the other. If your ok with Parkway East Hospital there are four doctors that have clinic there. One is Dr. lucky and Dr. Fong lady doctors. There is Dr. Roland who is male. My pearsonal doctor was Dr. Lubna. I have spoken about my experience with Her in another thread.
I hope you find a dr you are most comfortable with. Please enjoy your pregnancy its a wonderful thing!!!!