I wonder if teams were forced to take the same bus company into downtown, or if the team that went via Zhongxiao Fuxing did it for their own reason?
According to this website
, there are three bus lines running to Zhongxiao Fuxing: Changrong, Dayou and Feigou. Dayou and Feigou (represented in pink) run directly to Zhongxiao Fuxing, but Changrong (represented in orange) makes a stop at Minquan W Rd Station first, which saves teams that get off there about 10min, even taking into consideration the time needed to change metro lines.
However, Guoguang (represented in cyan), leaving every 15min, runs directly to Taipei Main (Train) Station, which is just one stop away from Ximen. I suppose that would be the quickest way to get from the airport to Ximending by public transport?
So back to the main question: why did the team take the bus to Zhongxiao Fuxing? Because of producer instruction, limited information, or for some other reason?
(The map is drawn by me and by no means official.)