Could you advise me which border crossing is better to take an underground to the Airport Shenzhen from Hong Kong ?

I heard that connection between FU TIAN and Baoan AIRPORT is already opened (connection Convention and Exibition center) and that is better to use FU TIAN border check point than LO WU, while there is less crowd then on LO WU. Could you advise me which border crossing is better to take an underground to the Airport(line 4 or line 1). When we have to leave Hong Kong to catch the plane at 10 pm. Thank you Ales