Our group of three had a spectacular visit to Uzbekistan with Anur Tour. It was probably one of the most well-organised and streamlined tours I have ever been on, especially because there was a lot to coordinate across the three different cities.
The tour guides in each of the cities were knowledgeable and experienced, and there was flexibility to explore on our own, see some other sights, and pick our preferred accommodation. The trains were also very modern and comfortable. Make sure you go back and visit some of the sights in the evening, as they can be quite different and beautiful with the lights shining on them. Highly recommended!