Probably for the screen tearing it is just you didn’t properly configure the monitor, and the video driver. I have absolutely no tearing on KDE with Nvidia.
I would take with a grain of salt what others are telling you, when they don’t own an Nvidia card. The issue here is not Wayland, but it is Nvidia on Wayland, on KDE.
Anyway, it is very quick to make your mind, just install the few packages needed, do the few configuration here and there, and reboot. You’ll see how bad/good the experience is.
Then go back to X11 probably 
//EDIT: About the screen tearing, make sure to have the PROPER refresh rate selected for your monitor, for each resolution, their should be an default/optimal refresh rate, for example my Samsung monitor has two “60Hz” options I can select, they both are actually not real 60Hz but slightly under, like 59,85 and the other something more or less similar, but only one of these two get me correct refresh rate, and no screen tearing.
Also it is probably needed to use Composition Pipeline (or the Full Composition Pipeline) in Nvidia Settings, for no screen tearing, this was the case with my Samsung, now with my new ASUS monitor I just selected the default refresh rate for the default resolution, and no tearing at all.
Don’t forget to restart Nvidia Settings with sudo when you have it properly configured, and save the configuration under the /etc/X11/mhwd.d/nvidia.conf file so when you reboot, the defaults are the already pre-configured settings. Without doing that when I required the Full Composition Pipeline, it wasn’t working properly.