In my experience, High Sierra is pretty much the same as Sierra. There isn't that much difference between the two, but I've run into three annoying and consiste

In my experience, High Sierra is pretty much the same as Sierra. There isn't that much difference between the two, but I've run into three annoying and consistent bugs: pressing command+space doesn't always open Spotlight Search, meaning sometimes I have to press it twice; there is a memory leak in WindowServer that causes OS instability over time (my WindowServer currently says 27.94GB in Activity Monitor); and, using QuickTime in fullscreen sometimes causes weird fogging issues in the video, making it look washed out when anything besides the video is on screen (like the QT controls, mouse cursor). The only one that really causes me major problems is the WindowServer memory leak, because it sometimes randomly cause freezing in the entire OS, sometimes not unfreezing and requiring a restart.