I have a 4K 5th gen (bought December 2020) and I love it but this is my first Apple TV. We have Rokus on all the other TVs. I like Roku and have been a user for years but this Apple TV works very well, albeit like everything Apple, it was pricey. Oddly enough the remote is terrible and took a lot of getting used to. Now that I have gotten used to the trackpad, I actually prefer it. I can control the Apple TV with my phone as well so that's an option also.
I initially had some issues with the HBO app - would require a device restart to access but that appears to be fixed. I am happy with mine.