My friend gave me her octopus card that i just have to re-load. I am traveling w/ my 6yrs old daughter. Kindly suggest what would be more practical & cost effective? Should I buy just 1 MTR card since I already have octopus card? Or I should buy 2 MTR Travel pass card with 2 Airport Express single journeys? My itinerary would just be Airport to TST to Central to TRAM to Central to TST to Airport. Thank you & Good Day!