bus of train?

normally bus is a little cheaper. By bus, it means you have many options for departure. The bus stop at many places in HK, like HK airport, Wan Chai, Tism Sha Tsui area etc. By rail, you would need to go to Hung Hom only for the trip. By rail, it may easier to confrim your arrival time as it follow a certain schedule, no traffic problem. The immigration check begin 45min before departure.