Hello @BMWR75 
Welcome to the Creality Forum…! 
I’ve had the K2 Pro with the CFS (300 x 300) now for a couple months using it just as a hobby for design projects and have no real complaints. I did have to replace the filament cutter which is pretty easy. One thing I noticed on this one was the lack of accuracy of the build plate temperature. Setting it at 60°C shows 55°C or lower in some spots so that’s something to watch. My Ender-3 V3 and the V3 Plus have good accuracy on the build plates just for comparison. No mods or rooting other than a CFS riser designed by @Darren3dPrint. Great addition by the way.
3D Printer Files | 3MF File | D3P Riser for K2 Pro | Creality Cloud
I don’t have any comment on the K2 plus other that it is quit a bit bigger (350 x 350) so it would depend on how much work space room you have. 
Might be my next one. 
I did a initial review of K2 Pro here when I first got it: