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Manjaro, because it's rolling release and it's built on Arch, only the necessary stuff is installed (including a desktop environment), you can set it up with just a few clicks, and it works out of the box, and even proprietary GPU drivers are easily installable with mhwd. Stable and reliable.
In case anything breaks, there's quick help on their forum, which (when it happened to me once) outperformed customer support of proprietary software.
It's been my daily driver for almost 8 years without any major issue.
So in short, robustness, rolling release, simplicity, community.
Edit: I have to add, my use case is for a desktop PC for software design/development + a little gaming.
Same here, I used to use Arch but just got tired of constantly tracking down conflicts during upgrades. Manjaro may be hacky but their hacks seem to get things to work smoothly 99% of the time. I install it on computer illiterate relatives and friends because I know it's not going to create a support nightmare for me, and I still get all the software one could want via the AUR.
Hell, I have one cousin that's convinced that he has a Macbook because I set up KDE to look like MacOS. I haven't had to fix anything on that laptop (except printers) since I installed it for him 5 years ago. He just does his updates via Octopi and carries on.