I know this is a bit late for a reply, but sonarr and radarr allow you to set specific requirements it must meet as well as things you’d like it to have. In my case, I’ve told not to get anything 4k or above (no 4k displays so why bother) or less than 720p and to prefer h265 since they are always a lot smaller files. It will even replace h264 copies if a new h265 comes out. It does great at finding nice looking copies in a small file.