ADO bus to the Hotel ZoneorADO bus to Tulum?

The short answer

For one traveler the ADO bus to the Hotel Zone is cheaper by MX$275. That does not change up to 8 travelers.

The ADO bus to the Hotel Zone is quicker: 45 min against 2 h 40. The ADO bus to Tulum varies between 160 and 185 minutes.

ADO bus to the Hotel Zone: 10:05–18:05. ADO bus to Tulum: 11:40–20:00.

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 Tulum	Difference
1	MX$170	MX$445	MX$275
2	MX$340	MX$890	MX$550
3	MX$510	MX$1,335	MX$825
4	MX$680	MX$1,780	MX$1,100
5	MX$850	MX$2,225	MX$1,375
6	MX$1,020	MX$2,670	MX$1,650
7	MX$1,190	MX$3,115	MX$1,925
8	MX$1,360	MX$3,560	MX$2,200

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 Tulum

From: Terminal 3, the ADO counter outside arrivals; it then calls at Terminal 4 and Terminal 2
To: Tulum, the ADO bus station in town
Luggage: One checked suitcase up to 25 kg and one small bag at your seat, at no charge.
Runs: 11:40–20:00
Journey: 160–185 min

Only six a day: nothing before 11:40 or after 20:00.