Where is ChromeOS in the list?
Four years ago, as an experiment, I paid £175 for a Chromebook to see if I could use it as alternative to my Windows laptop for travel, this means a full day in London without a charger etc.
After four years there have been about 5 occasions where I've needed to use "real" MS Office (presenting embedded video in a PPT) other than that it works fine and has travelled all over the world with me.
It has the added advantage that getting internet connectivity on the move is a simple case of simply plugging my Android (4G+ Internet - often better than my home fibre broadband) into it and it simply works.
Thus I've just upgraded to a new Chromebook ultra slim, with full HD screen, metal case, 11 hrs on a charge AND it supports android apps, thus MS Office 365.
Cost of this new beast £220.....
Can't see myself ever needing to lug my Windows laptop again!