The prevailing wisdom used to be that if somebody is tired of Windows and wants to switch you would send them to Ubuntu. Having used Ubuntu and Debian and Mint and Pop! OS and CentOS and Red Hat and Fedora and Kubuntu, Kubuntu with the new KDE plasma desktop seems to be the most Windows like while still retaining the Linux flavor OS that I have used so far.
Ubuntu by comparison is slow and convoluted and those are huge turn offs for neophyte Linux users who want to get away from Windows.