I suspect any researchers working on a project with such catchy words as "comparing" or "comparative" do theory for theory's sake: they slobber over theory without seriously looking at real issues in the real world. This book, by two scholars from the ivory tower, is clearly an example of this empty endeavor. It is just a collection of incoherent graffiti. I am not claiming that their arguments are illogical. Rather, I am just saying I don't understand for what and for whom these two puerile gangs are doing this sort of research.
In a nutshell, any serious intellectuals (I don't care about pedants like the authors) should skip a frivolous book like this. Do not be deceived by praises from their playmates.