I have Ubuntu, Mint, Kubuntu and Zorin running as virtual machines in vmware player to test them out. I have a laptop laying around that I want to run linux on.
I like the cinnamon destop. My two main beefs with Mint are the software center is kinda cheesy, and you cant upgrade to new realeases automatically. You have to manually edit repositories.
I like Ubuntu, not a big fan of the Unity desktop though.
Zorin is OK, not sure about it yet though.
Not a fan of Kubuntu interface.
I have only tried the LTS versons of each, not the latest.