How to take mtr from mongkok station to hk airport?

Two routes are suggested:
1, you can use the Tsuen Wan Line to Lai King Station and change to Tung Chung Line to Tsing Yi Station. Then change to the airport express to reach the airport directly. In this way, the costs around 68HKD.
2, you can take the Tsuen Wan Line to Central Station. Get out of the station and walk to the HK Station to take the Airport Express. In this way, the fare is around 112HKD.