Private Transfer vs Taxi at Cancun Airport
The difference is less about the vehicle and more about what is already decided before you walk out of the terminal.
What travelers usually care about
Most people comparing taxi and private transfer are really asking a simpler question: do I want to decide transportation after landing, or do I want it settled before I get there? That is the practical difference.
With a private transfer, the route is already set
You already know the destination, the booking name, and the price before arrival. That removes most of the airport decision-making when you are tired or traveling with family.
With a taxi, the uncertainty starts later
Taxi can still work, but the decision happens in the airport environment itself. For some travelers that is fine. For others, it adds one more negotiation at the worst time.
The real choice is control versus improvisation
If you value a fixed plan, private transfer usually feels cleaner. If you are comfortable sorting transport on arrival, taxi may be acceptable. The important part is knowing which kind of trip you want.