I've been running Mint Cinnamon 64bit for just under a year now. My second machine is Zorin OS 10 KDE 32bit.
Between the two there are significant differences. I prefer Mint as it
seems much more solid. Plus, the Mint forums are usually pretty active.
Zorin has a slightly flat feel to it even though you can customise it, make it dance and sing. Zorin in my opinion, is slightly more
Ubuntfied.
I am not really impressed with official Zorin forums and usually end up here
http://www.linuxquestions.org/questions/ if I get stuck.
The new Linux Mint 18, I have running in VirtualBox just to see what the differences are betwixt the two Mint OS's. To be honest, visually there is not a lot, but it runs on a more recent version of Ubuntu adding drivers etc. I am confident that in a couple of years I
will be switching over to it.
I find that some things run better on one system than another, hence the two OS's. Weapons of choice.................
But, like OTL says, its down to personal preference.
My preference is Mint over Zorin (close 2nd place). I just wish my ISP would stop pis***g about so as I can try out the
MrNiitriiX OS.
I like change, but not too much.