I’m 80% at requiring it for anyone at the company that doesn’t need full acrobat to create PDFs. And even then I’m close to pushing the version of FoxIt that does that.
I use okular and it works great on linux. Once in a while PDFs with forms display funny, or some minor challenges with data entry....but not sure if the issue is how the pdf was made or if okular. Nevertheless, i really like it. Plus as stated, a few KDE applications like okular happliy can be used on Windows. (For work machine, where i am forced to use Windows, i happily have used the Kate text editor.)
I think PDF Xchange is the most feature rich for what I use it for. You do have to buy once to unlock all functionality, but a very large amount is available in the free version.
On Linux: zathura, evince, okular for viewing. I don't know of a friendly GUI tool for editing PDFs, but combinations of imagemagick and tools such as pdfunite work well. A bit off-topic, but nomacs and imv are nice for images.
In chrome://flags you can search for "PDF" and enable the following: Performs OCR on inaccessible PDFs, PDF XFA support, Accessible PDF Forms, Enable Region Search on PDF viewer.