All very good options. I lived in DB for a little less than 10 years as it was a (relatively) easy commute to the airport and very easy to get into town. TC has horrendous air quality and the addition of the tunnel and bridge to the mainland has changed the overall dynamic. South Lantau is great if you have a car or want to roll the dice on the buses, spent a few years down there before moving to DB. The best way to know what will work for you/your family is to go and visit each region, spend a day or two there; explore the public transport, the schools, the communities. Everyone has their own preferences, but luckily it isn’t too much of a pain to move after a year or two.
Good luck!