So, here I am, having played with Ubuntu for a while. I chose Ubuntu over Mint because it is more up-to-date and has a far larger repository of packages.
However, Unity SUCKS. It is an unstable piece of shit. I am utterly baffled at how this made it into the "stable" branch.
I tried a few flavors of desktops, including KDE's new Plasma, which is beautiful in terms of eye-candy but riddled with bugs. It is so buggy it almost gives Unity a run for its money. Unity is based on GNOME which has far better desktop-to-application integration than KDE. However, neither of these handle HiDPI (any resolution above HD) very well. They are all over the map and totally inconsistent.
I ended up installing Cinnamon on Ubuntu and, I have to say, I am impressed by its consistency and stability. It handles HiDPI right out of the box without much fiddling. The only thing that annoys me a little is its handling of "snap to grid" icon arrangements. It only snaps to columns but rows remain free-for-all.
My Yoga 3 Pro runs smoothly under Linux, much smoother than Windows 10, which is odd given that Windows was pre-installed on this thing. It tends to stutter a lot under Win 10, especially when running Skype. Never happens under Ubuntu. It's possible that this is due to incorrect or, possibly, outdated drivers under Win 10 but, I reiterate, it was pre-installed and therefore should be best optimized under Windows.