I don't think the Landis book is equaled for the wealth of information you can actually use. It is, IMO, by far the best of the listed choices as a functional, utilitarian guide to PA trout streams.
I agree with Rich that the Sajna book was unique and entertaining, but as a functional guide, it was a little weak, IMO. But its certainly worth owning. Even after all these years, its hard to say anything even mildly critical of Mike's work. He was such a genuinely great guy.
I have a soft spot for Joe Armstrong's book on the limestones because it was actually (or initially) a project to benefit PATU. I think its a neat book if you right size your expectations going in. It has a lot of Joe in it and that's a good thing, IMO.
I haven't had the opportunity to become familiar with the Wolf book. IIRC, its one of a series published by the Falcon Press. There are at least 20 state-level books, of varying quality in the series. I've found the ones for Washington, Wisconsin and Michigan to be pretty helpful to me. And I agree with Pad that the Hub Cities/If You Go pages that divide the geographic sections of the books are a useful thing. All the books in the series are set up this way.
Charlie's book is pretty good, even if the prose is a little painful from time to time. I actually think Charlie's first book, "Meeting and Fishing the Hatches" is his best effort and most worthwhile book.
JMO/YMMV