My hot take is the AppleTV will last you years where the fire stick will probably get frustrating after a while.
By that I mean the AppleTV is fast. Of the other streaming devices I’ve used (newer chromecast, Rokus), my first gen AppleTV 4K still is snappy and feels better. I think I got this thing in 2018.
That may not be the end all for you, but when you compare a lot of these devices back to back, the AppleTV just feels better to use.