I don’t think there’s a big enough jump to warrant any of them. The Clara has similar touch only design, but it also doesn’t support Overdrive and has a considerably smaller 6” screen against the Aura One’s 7.8”. The Forma has an 8” screen and Overdrive but side buttons.
The Forma is probably the closer of them. The Aura One was the highest end eReader they had at introduction and that’s currently held by the Forma.
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