"Might is Right" (https://ia803202.us.archive.org/0/items/might-is-right-by-ra...). Not as a way to form a personal philosophy, it's obviously not a book to build but to tear down. And in that regard it does it better and simpler than Nietzsche and with much less stupidity than Stirner, in my opinion.

I also find the writing style pretty attractive, same way that Magma's music can be "attractive".

I guess that Kaczynski's short manifesto could also change some lives, as it is pretty good (not without faults, though).