When comparing PCLinuxOS vs solydK, the Slant community recommends PCLinuxOS for most people. In the question“What are the best Linux distributions for KDE Plasma 5?” PCLinuxOS is ranked 20th while solydK is ranked 40th. The most important reason people chose PCLinuxOS is:
The distribution is continually updated, so there's no need to install OS upgrades by hand.
Specs
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Pros


Pro Rolling release
The distribution is continually updated, so there's no need to install OS upgrades by hand.

Pro Stable
PCLinuxOS is designed around stability.

Pro Multiple desktops available
Mate, LXDE, and KDE desktops are available.

Pro Can remaster the boot DVD
PCLinuxOS has built in tools for remastering bootable DVD into a copy of current install.

Pro Excellent hardware compatibility
Comes with nVidia drivers out of the box. Important if the PC has an nVidia chipset. Most Debian based distros don't have nVidia drivers available at install time.
LXDE version works well with older hardware.
Pro Solid
As the name would suggest, SolydXK is rock solid Debian.
Cons
Con Installation fails most of the time, error messages, and hard to go to full screen in virtual box

Con Uses RPM packaging system
Uses the RPM packaging system with APT, rather than the more popular DEB packages.
Con Installer doesn't recognise partition table SOMETIMES
On a couple of occasions the installer has told me one of my disks is missing a partition table but it definitely has one and other distros haven't presented this warning.
Con Default theming not to everyone's tastes
The default icon theme in particular is IMHO pretty ugly. Easily changed but if you like to just plug & play without changing themes it may not suit you.
