KDE
With Plasma, you have a full-featured Linux desktop environment that has everything you could possibly need to use your computer. KDE is one of the largest and most active open-source communities with an ecosystem of applications for every purpose you can imagine.
While idling, KDE Plasma Desktop is using 580 MB with no other applications running than the terminal application. XFCE (Ubuntu) is only using 490 MB when idle.
In addition to KDE Plasma Desktop and XFCE, you can also install a desktop environment from any official repository of your Linux distribution. Both desktop environments have easy installation options and can be found in official repositories of all popular Linux distributions.
System Update
sudo apt update
Install KDE
sudo apt install kali-desktop-kde
Select Display Manager
Change Kali Desktop environment
sudo update-alternatives --config x-session-manager