Due to work requirements, I'm mostly back on Windows 10, but Ubuntu (and Mint) are fine to use on a daily basis if you're not obliged to use certain apps; both distributions run reliably on frugal machines, which suits me fine. I use Ubuntu MATE because I also like minimal desktops and GNOME tools.
For photo editing and
DAM, I work with
darktable and
XnView as a DAM on all systems; RawTherapee is very capable, too, but I like the fact that I can put together a collection of my most used tools in darktable (called "Favourites") and thus work way quicker than with RawTherapee. If you have more extensive corrections and edits to make, RawTherapee has better facilities and is more versatile - but I rarely do that, so darktable fits my needs better in most cases. I also like the fact that Polarr, another favourite of mine, is available on GNU/Linux as well, even though it's not Free Software (as in speech, not beer).
I think it's worth mentioning here that darktable on GNU/Linux offers very good printing features that are missing on the Windows version.
I also enjoy a couple of other GNU/Linux goodies - like simple scripted backups (with shell scripts). And if you want the latest and greatest software, there are several ways - especially with Mint (and mostly, Ubuntu), I found PPAs a valid (if somewhat random) way of getting up-to-date applications.
M.