arch if you have time

endeavour if you don't. you can delete the endeavour parts in the os and you will have a pure arch installation. i recommend plasma.

for beginners mint. it is not on the latest kernel therefore modern computers may not work with it.

fedora is the most modern linux with the latest kernel. you can also run it with plasma.

if you want ubuntu for any reason (i do not know any) i recommend kubuntu.