I think that there's an unspoken presumption in your question that the difference in performance between the Forma and the Aura ONE is so great that it might render the Aura ONE obsolete. I think this is a mistaken presumption.
Hardware-wise, off the top of my head, I am under the impression the processor, battery, and much of the hardware is the same. There's a new LED array, since Kobo moved away from the RGB array to produce the natural lighting colours. The Forma's e-ink screen uses a plastic rather than glass substrate, which makes it lighter and more resistant to abuse, but does nothing to enhance the reading experience. The Forma also has buttons and an accelerometer. The Aura ONE has an ambient light sensor where the Forma does not.
When it comes to choosing between the Forma and Aura ONE, I'd just pick whichever one whose features you prefer.
On the other hand, if you're more concerned that the Aura ONE will be rendered obsolete by what Kobo may bring out this year, that's another question. I had the same concern last year when I purchased my own Aura ONE until I was able to try out a Forma. This is a matter of opinion, but I can say if I didn't own an e-reader at this point, I'd buy an Aura ONE even with this concern since after using it for a year and finding it perfectly suited to task, I've decided I'll use mine until it breaks down. E-reader technology seems to progress at a glacial speed, so I don't expect I'll miss much in the interim. Keep in mind that any reader Kobo brings out that significantly outperforms the Aura ONE will likewise outperform the Forma.
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