The difference is Amazon ecosystem vs Google ecosystem. They run all the same apps and Fire TV sometimes get exclusives that Android TV don't get. I don't know why your Fire TV devices don't last I've have many of them since they launched and they have been bulletproof. I quit using them long before they stop working. But anyway. The Chromecast With Google TV is probably the best in that range but I don't really know what all is available in Canada.
In Canada, ROKU TV is the most popular (at least here in BC it is). I have used it, it's good but I find Google's Chromecast with Google TV better. I bought one for CAD 50 last week.
The Xiaomi TV Stick 4K is the affordable Android TV device to buy in 2022. It can be purchased for under $70 CAD from AliExpress and there's a good video review of the product here .
For that price the Chromecast with Google TV is your best option.
If you're asking about Chinese brand Android boxes then try /r/Android, this subreddit is for official Android TV devices only not those piracy boxes.
I suggest the onn tv box from Walmart Cheapest ,best and certified android tv box Simply best