Best Linux x11 DE

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I currently use Debian and Xfce as DE on a low-resources PC :

→ Fedora recommends 2GHz quad core processor and my hardware has 2 cores of 1.10 GHz as Processor Base Frequency ;

→ it has ever been discussed on the PG forum that GNOME requires at least 8 GB of RAM and I’ve only 4 GB ;

So, do you think the best thing I can do in this configuration to improve system security is to add Kicksecure to Debian ?