Taking HK airport express or the hotel's shuttle bus for BP International Hotel

Hi.. We're a family of four bringing 8 pieces of luggage going to BP International. The hotel offers an Airport Shuttle service, but we want to take advantage of Airport Express Travel Pass. Is it convenient to carry that much luggage on Airport Express and on the Hotel Shuttle Bus? Or do you think it's better for us to use the Hotel's Airport Shuttle service (Costs about HKD 120 each way per person)