KDE Plasma is the most like Windows, in that you have a start menu like setup, and the task bar. KDE is extremely customizable, to the point that it can look completely different to the original intent. I'm not a fan of Plasma, but its one of the most popular. Many Windows switchers prefer it simply because its very much like windows
Gnome goes in a different direction and I suppose its more mac like, the app launcher (called the dash) is like Mac's Dock. Gnome uses extensions to customize and alter the look, so built in customizations are not there, per say, but there's a rich inventory of extensions to make Gnome your own
Cosmic - it was first a customized shell on top of Gnome, it is now its own DE, and while it offers many similarities to Gnome, System 76 went in a different direction and its quite popular, even on non-POPOS machines. I have it installed on my machine.
Xfce is an older DE, best for low end, or older machines
I was going to continue listing the other DEs but you can test drive them here:
https://distrosea.com/ For instance, select Fedora and you're presented with the version of fedora and the DE
Quickly try out Fedora Linux online on your web browser on DistroSea
distrosea.com
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