So thinking about taking the train to the airport tomorrow. Want to time it right (because last time I went everything was running late, missed the Express and had to wait about 20 minutes for the City train).

I'm staying close to both Sukhumvit MRT and Asoke BTS. Am wondering, should I take the BTS to the airport train station or the MRT? Last time I took the BTS and the connection overwas very simple.

Thanks!