All the books took a lot of effort on the authors part. I have my preference but I will not say on this board whose book it is because I need it for my purposes and others may need a book for different purposes. Some books have pics and some don't. Some have better price guides than others. It is just a matter of what one is looking for to determine which book they might prefer. I must congratulate all the authors for their effort though. They are doing a great job.