I have long held a bias of KDE being the clunky and slow option from trial in the ~early-oughts. Within the past month or so I installed it to give it a spin and haven't switched back to XFCE since. It strikes a good balance of customization / speed / taste / and just working out of the box. Thanks KDE team!

If you are someone that mostly likes the Windows 7/10 experience, KDE out of the box is basically that. It's more customizable. It's (IMO) less clunky and less burdened by legacy components. But it really just feels like windows used to feel like.

But also just fast and low memory. You can run KDE on ancient hardware. If you have something like 512MB of ram, you can do KDE just fine.