I'd recommend Mint (Ubuntu based, not the Debian based build). If you prefer more of a classic and clean interface, go for MATE. If you prefer the newer graphically heavy interfaces, Cinnamon will probably be better for you.
if you're saying release date, mate is newer.
As for recommended distro, it depends on the person you are.
If you don't like change, maybe chaletos or zorinos.
If you want to experience actual desktop linux superficially, mint, or any of the ubuntu spinoffs with different desktops.
If you want to be up to date and don't mind doing a bit of stuff with the terminal, fedora, debian testing, manjaro.
If you want a GUI configuration panel on steroids, opensuse.
If you want to dive deeper and find out what makes linux tick, arch, gentoo, funtoo, or linux from scratch may serve you well.