I'd find a distro to settle on, not a desktop environment. Most distros have most desktop environments. Ubuntu, Linux Mint, Fedora, Debian all ship the major desktop environments. I would simply choose the one that best fits your needs.
Want to run on the newest software available? Fedora
Want long-term support for the install and am okay with using slightly older versions of software? Debian
Don't care about the software part, and the most ready install out of the box? Go for Ubuntu or Linux Mint
In terms of desktop software. KDE is the most like Windows, but still far better in my opinion. Gnome is its thing, more similar to a mac, but still not quite the same.
I’d still find a distro to settle on, not a desktop environment.
What desktop environment do you want to try that you can't find on Debian, Fedora or Ubuntu?