Start with your arrival deadline
If you have a train or a scheduled event in Agra, choose the direct car unless there is enough spare time for both the visit and unexpected delays. Avoid relying on a late Taj Mahal entry after a full sightseeing transfer.
Choose one stop if you are short on time
Chand Baori suits a focused stepwell visit; Fatehpur Sikri is the better priority if you want time for Mughal architecture. For two stops, leave early and confirm the opening hours for both.
Compare written quotes, not only fares
Ask about luggage capacity, waiting at each site, parking, entry and guides. A direct cab and a sightseeing transfer may have very different inclusions.