Better in what sense?
What exactly are your route options? If both your routes see you aiming for Astrakhan in Russia, or the Caspian port of Aktau, then Uzbekistan makes more sense. Uzbekistan has more conventional sights to see (restored Silk Road cities). Kazakhstan is vast, lots of the country is flat and empty and the cities are of very little interest. There are however some beautiful spots (mountains near Shymkent, North Aral Sea), many more if you take a less direct route. Regardless, the route through Kazakhstan will be much longer.
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EurasiaOverland a memoir of one quarter of a million kilometres by road through all of the Former USSR, Western and Southern Asia.
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