Having looked over a bunch of the docs, I have yet to find any compelling reason to upgrade Ubuntu server 14.04 on a low end (512MB digital ocean) droplet. I don't need ZFS, and am not sure why I would want systemd -- and these seem to be the only server focused changes of any import.
More importantly though, I was wondering if the memory usage/footprint and/or performance would be any different/better/worse on the same machine. I can't find any links that discuss this aspect.
Can anyone explain to me why I would want to upgrade?