The most significant difference for me is dark mode. On the Forma, to get it you have to use developer options or NickelMenu (and in the latest software, you also have to restart the Forma). It's built into the Sage and you can change from normal to dark and back when reading a book. The main difference between the two is that on the Forma, the dark background is not very dark, while it's much darker on the Sage. That makes the Sage a worthwhile upgrade, since I read a lot at night and have trouble reading with the normal mode, which is too bright. In normal mode, I don't find much difference between the two.
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