Hi David ,abuQutaita
i do belive thats Private Tours is always Better choice Specialy at the Ancient Destination , such as India China Egypt , if you the diffrente is not so big in Money , so just stick with the Private Tour
in places like the Pyramids in Giza it will be much niccer been with Your Own Tour guide and Driver , so you dont have to wait till the Group finish his visit to the Sightseeing
also if you would like to stay Longer at the place you are visiting you wouldent ask the guide to take an Excuse to the other Traveler to allow u the time you want ,
so its always Better to do a Private Tour