I have Macbook pro mid 2012 HiRes display (non Retina) with SSD drive installed. Currently it has MacOS Sierra and it works pretty well. But I wonder if High Sierra at the end became as good or even better than Sierra? Or mabe I should try even Mojave? I assume newer OS might convert my file system to APFS, so it might be a headache to downgrade back to Sierra, that;s why I decided to ask comunity. For me main priority is stable system without headaches. Not very interested in a new functionality, but would be nice to have not too old OS to be able to install newer software (like XCode). Thanks for advice.