I am torn on whether I used the word arguably correctly in my original comment. When I first posted it, I thought I could find many sources that had argued it was PKD's best work.

Upon trying to find those sources I could only find Terence Mckenna's article on it, in which he doesn't exactly argue that it is PKD's best work https://sirbacon.org/dick.htm

Perhaps I now believe that those who read the book and "got it" would argue that it's his best book and perhaps even the best title.

But part of me wondered just now if those sources were out there and now I cannot find them.