Most economical From HKIA to Marco Polo Hotel

Traveling with wife and 3 children and was hoping to get from HKIA to Marco Polo Hotel on Canton Road the most economical way. How much by Taxi? and can three adults and two small children fit in the Taxi? If by Train or subway, is it recommended with luggage on tow. Or best to take the Express Train to where nearest to Canton Road? Thank you.