Used Kubuntu for a long time, but changed to Xubuntu, because of it's lower resource usage.
I'm using Xubuntu, too. My PC is beefy enough to run anything; I just like the simplicity.
Well you must try Lubuntu if resources is concerned and you don't want to switch out of Ubuntu
The UI might not look great. But one of the advantages compared to other debian based distros is it doesn't take much space or resources.
I'm using 17.10 but it still uses 250MB RAM and 2% processes after starting up
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