Linux

Kubuntu is excellent for the stability imo. Super sane and low-demand defaults make for a reliable/enjoyable experience
I only use gentoo now so I can't offer suggestions other than maybe alpine for servers

If you want windows with sex apeal, the KDE desktop environment's treated me pretty well. I'm using Fedora, though you could get it from other distros too

Kubuntu is just really well polished. It works really well and stable nowadays. Only downside is snap.

Also have a look at Linux MX. Also very well polished and some really good tools.

Debian is always the forgotten choice. You can install kde at time of install. It's stable and can be upgraded in the background automatically even between major versions. Doesn't have snaps making hell for the user. For any apps they need the newest version of Flatpak is right there in Discover software center.

MX Enlightenment Respin has a unique and excellent look. Add some Propaganda Wallpaper Tiles to further enhance the vibe https://github.com/BenjaminHCCarr/PropagandaTiles

Another vote for Aurora.

Universal Blue in general has been really solid, I remember one time in the last year or two when there's been any need for manual intervention. And that came with a notification after boot, with a link to instructions that were all copy-pastable as-is to the terminal.

Well there are no operating systems that you can install and forget, unless they never plan to go online with the machine. They all need updating which can be set automatically. The only problem is if it requires manual intervention, sometimes updates don't go as planned, then a roll-back might be necessary. They could try an immutable linux distribution if they are worried about screwing up their installs or something. Fedora kinoite may be their thing, or Bazzite which is based on that.

Fedora KDE edition or OpenSUSE Tumbleweed/Slowroll. Otherwise could try Aurora.

I avoid Ubuntu base because it is slow to update packages, and the inclusion of Snap packages are a no from me.

ChromeOS Flex. Very low maintenance.

If you want a set it and forget it distro to never touch his computer again, then consider going a Ublue distro. Aurora (only KDE), or Bazzite (choose the KDE image) if he does gaming.

I want to try something windows like with more sex appeal.

Elaborate?

I don't want to have to touch this computer again.

This person will undoubtedly need help and if they can't help themselves you will be the one helping them. Mint is best-case for ease of use so your requirements are a bit contradictory.

Focus on the DE instead of the distro. There used to be one that has "windows look" as a goal.

Best I can offer is Hannah Montana linux