I had my first baby in Prince of Wales. I started off in the public system but was very uncomfortable with the lack of communication and it was not well geared up for non-Chinese speakers. I therefore transferred to the private O&G clinic at the hospital (9th Floor) and subsequently the private Maternity Ward for delivery and was much happier as the level of English spoken was infinitely better and they actually took time to answer all my questions without me feeling like an inconvenience.
Be aware, however, that Prince of Wales only has one private delivery room so if it is occupied you will have to deliver the baby in a ward with lots of other women which I hated.
Subsequently I went public at Queen Mary Hospital for my second child and was more than happy with the service there.