The Bradt guide is thoroughly researched and covers almost all interesting places in Kazakhstan. It is well-written by the original author, and is invaluable to anyone planning to travel Kazakhstan for more than a week or 2.
The 2nd edition is quite poor in its updates, though. Mistakes from the first edition have been copied into the 2nd edition, and interesting places that were skipped before have not been included. Only Almaty and Astana seem to have had a substantial update, but seeing the rate of change in these cities, many of the recommendations are already outdated. Despite this, still a very good guidebook, and the best choice for practical information for a deep exploration of Kazakhstan. Latest edition 2012.
Odyssey gives more room for Kazakhstan, offering more background than Bradt. The practical information is there as well, though some of it in story-telling form and not as easy to look up as in the Bradt.
All in all, it’s a great guidebook which also doubles as a coffee table book because of its many pictures and 2-page spreads. But when it comes to independent outdoor sports or cycling (it’s heavy!), this travel guide falls short. Latest edition 2010.
Find a quick overview of the best guidebooks for travel on the Silk Road on the overview page.