[perisiana]

Hi, I've always had a Kobo (h20 in the last 4 years), I just bought a Kobo Forma which I had to return due to a very strong light strip issue.
I knew that Forma had this problem, but I literally fell in love with ergonomics and decided to take the risk, hoping that the problem was not very evident (or that I would have been more tolerant lol).
Unfortunately the other two Kobo Forma in the store had the same problem, and I am a bit discouraged to be able to find a Forma where the issue isn't so obvious (if not completely absent).
Now my dilemma is, Amazon sells the Kobo Forma for the same price as the Kindle Oasis here, and the return to Amazon is obviously much simpler than in a store.
Should I buy a Forma from Amazon, and continue to send them back until I find a device where the defect is acceptably slight?
In my Kobo the defect was always visible, except with the light completely turned off, if the problem had been visible only with the light over 50% I would have accepted it, I usually read with the light around 20%
Did any of you succeed in this? After how many attempts?
Or should I buy an Oasis, which has almost everything I like about the Forma (mobius screen with flush frames, lightness, ergonomics) but the software part lacks in some things that the Kobo has (collections, the ability to read the synopsis without opening the book)?
I could try the Kindle software and eventually return it if I don't feel good...However I wanted to try a Kindle for a long time, because I love its dictionaries and the possibility of using Kindle Unlimited.
In short, for those who switched from Kobo to Kindle, how did you feel? (most of my books are sideloaded)
And did anyone manage to find a (almost) perfect Forma without going crazy?
I'm really confused (and disappointed by my beloved Forma, such an expensive device should not have these problems).
Thanks!