As one would expect, group tours usually offer the cheapest option for those on a tight budget. Economies of scale are the main factor at play here, where travellers can benefit from the savings associated with sharing resources.

One thing to bear in mind is that this does depend on the number of people in your party. For example, those travelling in a group of friends or family may find that the cost of a private tour can work out the same or even cheaper when compared with the per-person cost of a group tour.