19 adults, from HK AirPort To cosmopolitan hotel. What the best transportation?

Since your team has a lot of people, it is suggested to take a taxi. Although taxi can be chosen, but 19 of you still need to be seperated in about 4 cars. You can meet together in your hotel.
It is much cheaper than taking Airport Express and then changing to the hotel free shuttle bus. The Airport Express will cost you about 100 HK$ per person to reach HK Station.