Sometimes the overthinking that takes place here makes my head spin.
I admit to not having recent first hand experience with Android devices. At this point, we are firmly ensconced in the world of iOS, as far as our phones and tablets go. My husband also struggled using android tablets, and from the first use was much happier with an iPad.
The last Fire tablet I used regularly was the 2015 Fire HD 10". It was a pain in the rear the entire time, and I should have returned it. I ended up trying to use it as my Kitchen device, but the thing couldn't even run Netflix without almost daily force stopping the app and rebooting the Fire. It never ran Evernote dependably, and after a few months we replaced it with an older iPad.
That Fire was rebooted and reset to factory more times than I can say. We bought it refurbished, and it's my fault for not returning it. But I kept thinking updates etc. would straighten it out. Looking back...I think perhaps it had been rooted at some point, then returned to Amazon, who sold it as refurnished.
I loved my 7" Fire HDX, until an Amazon update broke the volume controls. I could no longer turn it up loud enough to hear above running water. I gave it to one of my daughters-in-law. Between the 2 of them, they have 3 of my old Fires, which they use mostly for reading. Even the first gen Fire was still in use last time I asked about it.
The 2012 8.9" Fire HD was nice because of the micro HDMI connection. I used it until it would no longer run certain apps because of age.
My iPad Pro is my go to device, with the Mini being second... I do 99% of my stuff on it. Our AIO Lenovo runs Win 10, Quicken, and a very old version of MS Office that I use for Women's Ministry paperwork etc. Split screen on the larger iPad Pro is great, and the "walled garden" so many talk about with Apple has never been an issue for me or kept me from doing what I need to do on the device.
I've never appreciated the superior air that some have for their OS of choice. Use what works for you. No worries.
