It’s in the eye of the beholder, of course. But it would be great to see some solid recommendations.
I don’t think it’s the distros job to look visually appealing. That’s the job of the desktop environment. Seriously I wish distributions would just ship vanilla desktop environments. All of the themed variants always have some issues. Maybe I’m just old and stubborn but that’s my opinion.
The new COSMIC desktop by System76 and Pop!_OS is very promising. I’ve been running the pre-alpha, and have been very impressed.
You’re asking about the desktop environment and its default settings, which may or may not be the same on any given distro.
But I have a tie between Plasma and Cinnamon (mint’s DE). They both take only minor tweaking to get where I want them, and I can use them both out of the box with zero complaints.
Linux Mint has a smooth, out-of-your-way look & feel to either MATE or Cinnamon that just makes me feel at home
LMDE (Mint Cinnamon)
Really depends on the desktop but in terms of default desktops that are shipped with distros I’m picking Fedora’s GNOME (pretty much stock) and MX Linux’s XFCE.
Just installed a USB boot for Mint (cinnamon) and MX (xfce).
Both are so much nicer than I expected.
Trying to figure out how to put together a sub-distro for friends & family that are considering moving away from windows.
MX ranks higher out of the box (comes with VLC installed).
Fedora Workstation. Gnome is pretty great on the eyes, and there’s a healthy Libadwaita apps ecosystem that is just *chefs kiss*
ElementaryOS also looks great for the system and core apps, although there’s not really a third party app ecosystem that fits with the Pantheon theme, unfortunately.