KDE Okular vs Atril
When comparing KDE Okular vs Atril, the Slant community recommends KDE Okular for most people. In the question“What are the best PDF viewers for UNIX-like systems?” KDE Okular is ranked 1st while Atril is ranked 2nd.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free and open source
Pro Trim margins
Easily trim margins either automatically or manually for easier reading
Pro Featureful
Pro Table selection
Pro Tabbed view option
Pro Supports touch interaction
Pro No GNOME3
It is a straight port of the GNOME2 Evince to GTK3 without sacrificing its UI like Evince 3 did. It also has all the cool stuff that professional apps need, like: Menubars, editable Toolbars, Menus with Icons, Menus with keyboard shortcuts.
Pro Great Evince fork
It has been forked when Evince was still good.
Cons
Con No XFA Adobe Forms support
Cannot fill PDF Forms created with Adobe.
Con Requires many KDE libraries
Con No middle-mouse auto-scrolling
Instead of scrolling automatically when holding down the mouse wheel and dragging, it instead zooms in or out, in contrast with many other programs.
Con Poor HiDPI support
You may have to tinker with QT__SCALE_FACTOR environment variables to get the desired size and not blurry content (this is a bug; see https://bugs.kde.org/show_bug.cgi?id=362856 and https://bugs.archlinux.org/task/54688)
Con No search results overview
You have to navigate to next/previous hit one by one
Con No "fit to page" option under printing settings
You can only print the content as given so, when you receive a bigger or smaller image thant the default of the printer, you will have to edit it first on other editor.
Con Slow scroll
Its new ultra-slow-scroll for PgUp and PgDn makes it unuseable.
Con Disappointing search
In comparison with its origin, Evince, the search results in Atril is disappointing. You can search, but only locates your search term per page, the one you're located on. Want to find it elsewhere? Search all pages one by one, page by page. Hence, I personally, working/ searching in large pdfs, therefore prefer Evince, which does give you the search result for the whole document. Apart from this, Atril seems a great piece of (fork) work.
Con Some GTK dependecy
It needs GTK+ and its dependencies.