Various Burgenland Lutheran registers showed up on FS a few months ago, partially indexed but uncataloged. (I've been slowly wading my way through Felsőlövő; I can tell that the opening paragraph mentions the Edict of Tolerance, but I haven't figured out what — if anything — it says about where or if things were recorded previously.) Thank you for the tip about these scans being now also found on Matricula; both its cataloging and its image viewer are superior to FS's, at this point. (Before the disimprovements to the catalog's image viewer, FS had the advantage in navigation and was equivalent in pan/zoom, but unfortunately navigation is now just as clunky and slow as Matricula's and pan/zoom are now smarter-than-thou and infuriating.)

(I notice that my unfavorable assessment of the Images section's cataloging has been edited out of my Jan. 5th comment's last paragraph, resulting in a less-than-sensible first sentence there.)

I think for these "dual-site" images, I'll be mostly using Matricula to find the event, and then seeing if FS will cough it up, either as an image or as an index entry, simply because it's at least slightly easier to work with FS sources on FS. But while I recognize that "will this still be here in a decade?" is a concern for all online images (including on FS), I seldom actually download or screenshot things, preferring instead to concentrate on good transcriptions and complete citations (or breadcrumb trails).

(I've never noticed any difference in quality between screenshots and downloads; perhaps this is because my laptop screen has ridiculously high native resolution?)