ADO bus to the Hotel ZoneorADO bus to Playa del Carmen?

The short answer

For one traveler the ADO bus to the Hotel Zone is cheaper by MX$100. That does not change up to 8 travelers.

The ADO bus to the Hotel Zone is quicker: 45 min against 1 h 30. The ADO bus to Playa del Carmen varies between 90 and 110 minutes.

ADO bus to the Hotel Zone: 10:05–18:05. ADO bus to Playa del Carmen: 07:50–02:20.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in MXN. The cheaper of the two is marked on every row.
Travelers	ADO bus to the Hotel Zone	ADO bus to Playa del Carmen	Difference
1	MX$170	MX$270	MX$100
2	MX$340	MX$540	MX$200
3	MX$510	MX$810	MX$300
4	MX$680	MX$1,080	MX$400
5	MX$850	MX$1,350	MX$500
6	MX$1,020	MX$1,620	MX$600
7	MX$1,190	MX$1,890	MX$700
8	MX$1,360	MX$2,160	MX$800

Where each one leaves you

ADO Aeropuerto · ADO (ADO Aeropuerto)ADO bus to the Hotel Zone

From: Terminal 3, the ADO counter outside arrivals; it then calls at Terminal 2
To: Puerto Cancún, at the north end of the Hotel Zone
Luggage: One checked suitcase up to 25 kg and one small bag at your seat, at no charge.
Runs: 10:05–18:05
Journey: 45 min

Get off at Museo Maya, Aquaworld, Plaza La Isla, Plaza La Fiesta, Playa Tortugas or Puerto Cancún.

Only eight a day: nothing after 18:05.

ADO Aeropuerto · ADO (ADO Aeropuerto)ADO bus to Playa del Carmen

From: Terminal 3, the ADO counter outside arrivals; it then calls at Terminal 4 and Terminal 2
To: Playa del Carmen, the ADO Terminal Turística in the town centre
Luggage: One checked suitcase up to 25 kg and one small bag at your seat, at no charge.
Runs: 07:50–02:20
Journey: 90–110 min

The 11:40, 13:00, 14:20, 15:40, 17:30 and 20:00 also run to ADO Terminal Alterna, about 80 minutes out: check the terminal on your ticket.

Nothing leaves Terminal 3 between 02:20 and 07:50.