Count the luggage after the bus
The bus handles the airport-to-stop segment, but the trip continues to the accommodation. Check kerbs, crossings, hills, station stairs and the distance from the exact stop. A short map distance can still be awkward with large cases.
Group size changes the comparison
Bus fare is paid per passenger while a suitable taxi fare is shared, subject to vehicle and luggage capacity. Compare the total group price rather than one bus ticket with one taxi fare, and do not assume every standard taxi can take every bag.
Traffic and operating windows remain live variables
A taxi removes transfers but not road traffic. A bus uses the same roads and has a schedule and defined stops. Check both on the travel day, preserve a second payment method and use official airport or Seoul information for current service details.