Last year I chose Man Sang and gave up Ming Wai. I haven't applied Lingnam as I live in North Point and prefer to choose a pre-nursery within walking distance.
After last year's interviews, the impression of Man Sang to me is better. In addition, one of my nephew studied at Ming Wai 3 years ago. His parents didn't recommend us to study there. That's why we gave up Ming Wai finally.
Maybe Ming Wai has improved a lot these years. To be fair, you should get more comments from existing Ming Wai parents.