I see comparisons between fossil and pwp's. I have become a fan of fossils after using ss/sss for a minute. What's the difference between the two? Does fossil hold flight characteristics longer?
Depends what Fossil, but mostly no.
Early fossil runs are very stiff/. Newer ones are much softer. Both are pretty low shouldered and flat (the newer softer ones being lower shouldered than the earlier stiffer ones).
PWs are stiffer still than the early Fossils (there are some softer PWPs, but the final PW formulation is all stiff that I have seen) and flat, but with a higher shoulder. They fly more overstable (like all higher shouldered Wizards).
Generally speaking, PWs are stiffer, deeper, and more overstable than Fossils. I use PWs as throwers mostly, although I will put a Fossil in when I need a Wiz that starts straight, and seasons faster.