which is the cheapest way to travel from Hong Kong airport to royal plaza hotel? by airport express or by taxi?

stay in royal plaza with 2 adults n 1 kid age 3+ with 2 big luggage

flight reach hk 11.30am on wednesday. pls kindly help to suggest which is the cheapest way to travel from airport to royal plaza hotel? by airport express how much or by taxi how much and will the road jam at that time 12.00pm or by bus?

thank you