Hi
It might be possible for you to create such a poll already, please check (certain options are getting activated as users are upgraded in their so called trust levels)
https://forum.fairphone.com/faq
Before creating such, my advise would be to consider whether you want to limit that to FP6 users or open to any Fairphoners. Plus there are more than two operational systems for Fairphoners, and while most are based on Android (e/OS included), that will not be true for all of them. Also, some users switch between various OS.
https://forum.fairphone.com/t/operating-systems-for-fairphones/
As mentioned before, I believe you will get a better picture of e/OS software experience from e/OS forum.
But honestly, if 90% users are happy with the phone and your unique experience is devastating because you can’t make your phone do the stuff you care about, imho this 90% becomes meaningless.
On a final note, there’s been a thing here to ask people about their experience after a year of a phone’s launch, feel free to check