Organizing guided tours with private minibus rentals – does it pay off?

[EdlaGar]

For group trips, I’ve noticed many companies offer private minibuses with drivers. On one hand, it seems practical—you all travel together, there’s no need to coordinate multiple vehicles, and the guide can share info during the ride. On the other, I wonder if the cost is justified compared to just renting cars individually. Has anyone organized tours this way, and was it actually worth the money?