if via Taxi - the taxi will exit at the same expressway exit (ploenchit). Distance from Don muang is probably alittle closer.
if via Airport Rail Link (only from BKK airport) - if not much luggage, I suggest you take CITY Line airport rail link, then take BTS Skytrain to NANA station. The hotel is right next to NANA BTS station
Do you know how much would be a taxi fare from BKK to Sofitel Sukhumvit? I am asking because I don`t want to get ripped off, as the taxi drivers in TH are notorious for that.
Also, should I just grab a taxi driver myself, or go to a taxi dispatch?