I have two laptops. On one of them I'm using Ubuntu and the other I just installed Linux Mint Cinnamon. I also have Kali Linux on a virtual machine. It's tough picking which distro to use because there are so many that have potential.
Its totally depends on your enthusiasm, if our are newbie to linux go for any Debian flavor like ubuntu, Mint......Kali is different, its for Pen Test. If you want to learn security then, Kali is best however for newbie Ubuntu and Mint is best for leaning.