I would have to recommend the Sage. The battery life is not the greatest (about 50% of most of my other ereaders) but I can read for several days before charging. Considering most of my devices require charging on a more frequent date, I'm not unhappy with plugging it in to charge every second day or so.
The Forma was sold from October, 2018 to October, 2021 (not exact but that was the Sage's release time) so the battery is at least 4 years old. The only person I know who purchased a used Forma found the battery has dropped to about 66% of it's original capacity though they seem happy enough with that.
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