I really like how consistent Ubuntu is, how they always deliver on their promises. In exactly two years we will be posting about 18.04, witch is very similar to 17.10. It's really something you can rely on, you always know what you are getting.
It's super how they do it with all the new versions of everything! I'm moving from Debian to Ubuntu on my data centers (3) this year, probably will go with 14.04 at first, but should follow soon with 16.04. Kernel 4.4 brings a lot more performance for people with 10K+ TCP connections in a server and 14.04 already have that! With Debian/Centos/RedHat we would have to wait a few years as they don't support those things officially.
I really like how you can trust Ubuntu on their support.