If you are talking about the site of Aaron Wall, I can't tell you if it's the best but it's definately worth taking a look at it. I have read both the seo-book he released and the one with the interviews and i found them quite useful
If by the best you mean overall, maybe it can be, but not all tools are in seobook. You might also want to check on Seoserp.com. they also have a bunch of new and useful tools there.