For things like single classes (or subclasses), small adventures, and collections of monsters or items I'm fine with a PDF, especially if it's something I might only use a couple times (and if I need to reference it at the table I can use my phone with minimal fuss). If I can pick up a physical copy, I'm fine with a softcover because it's easily replaced (if I even care to).
For bigger books that I'm likely to reference a lot, like core rulebooks—whether it's the entire game in one book, or the D&D Player's Handbook/Dungeon Master's Guide/Monster Manual trio—or larger adventures, I prefer physical over digital because I can write notes/put in sticky notes/bookmark pages, and I prefer hardcover over softcover because they last longer.
Of course when ordering online, I like getting PDFs bundled with physical stuff (that way I can start reading it right away).
Some people have other preferences, which is why thanks to Lulu and/or DriveThru's print-on-demand service we try to make things available in as many formats as we can (including B&W and color versions), so you can ideally get our stuff how you want it.
A Sundered World: Player Fragments, the first supplement for A Sundered World, is finally out!
The Paladin is technically the sixth "core" class we've provided an alternative for. If you interested in an alternate class that isn't merely a half-assed reskin, check it out!
By fan demand, we've mashed all of our 10+ Treasure volumes into one big magic item book, making it cheaper and more convenient to buy in print (which you can now do).