Been running the Pi 2b for some years now. Some apps lag a lot - probably because of resolution too high for Raspberry to cope - sound and pictures ends up being out of sync. Some of these apps are not possible to reduce resolution.
So I am planning new hardware, and I would like to stick to the Raspberry platform.
Model 5 seems to be availably now, but it seems that Model 3 has some hardware decoding build in - which the 5 does not.
I second this. IMO the Pi 5 is better suited to use as a desktop than for a media player and it has extra cooling requirements that limit your case choices. I have a Vero V connected to my main TV but I have RPi 4’s connected to four other TV’s in my house stuffed into FLIRC cases. I have kodi setup with a PVR as well as my library and they provide the entirety of content that is consumed. I have no complaints or regrets with these boxes.