So this is more a question; it is a bit gnome-specific, but both evince and - I think - papers can be used without running GNOME, e. g. some gtk application.
I have been using evince since many years; it is quite simple.
Does anyone have experience with both, from a user’s point of view? Is papers very different to evince? Will evince be eventually abandoned? Right now I seem to be fine with evince, but I heard papers has tabs, and I wanted tabs in evince, so this would be a good reason to jump ship. But I am a bit worried in that papers may not be as good as evince. Hence why I kind of just default to evince for now, without really having tested papers.
Evince will continue because other desktop like Mate has adapted it as its core apps. The GNOME 2 derived desktops now develop on its own and evince will continue in these desktops independently whether evince the current upstream will exist in GNOME or not.
But there again, the topic is about both - questioning perhaps which is the better to select for use. I pointed out that a newer version is available in Papers but that aside, I was specifically answering this comment:
I think between you and @tragivictoria it was muddled you were talking about Papers.
There is no 49 release of Evince, not yet anyway. On Flathub Evince is 48.1 and Papers is 49.1. Those are the most recent releases of both - Flathub is up to date. Papers is the fork of Evince ported to GTK4+Libadwaita.