The only thing the FireTV had as an edge was the Xbox game streaming app which worked fine over WiFi6E. Otherwise it was absolutely ad-ridden, poor UI/UX, and Amazon’s apps suck on any platform. Since I no longer use the Xbox stuff, the stick and the older versions I have line the bottom of some drawer.
The Android TV turned out be almost as ad ridden as the Fire Stick and no obvious outstanding features. Works ok though. I wanted it to sideload some TV apps from another country to stream those TV channels. But the Android apks didn’t behave well on Android TV so into the drawer it went.
The AppleTV can’t run those apps either, they’re not in the store but at least it’s not showing ads and the UI/UX and performance are top notch. Integration with the rest of the Apple ecosystem really brings value to me. And that brings me to probably the most important point.
In the end what matters more is what ecosystem you are or want to be in. Unless you have a super specific requirement or ecosystem preference then generally I’d rank them Apple TV > Android TV > Fire Stick. Amazon doesn’t have an ecosystem to speak of so it hard to take it as a serious competitor to Google and Apple.