If I want the maximum audio quality that YouTube never makes available, change 250 to 251.
This gives me AV1 encoded video stream with OPUS 64kbps audio (or 128kbps for code 251). Anything beyond 720p encoded by Google is usually a waste, unless there is some specific reason you need 1080 or 2K marginally better resolution increase. The VMAF cutoff for YouTube encoded videos is optimal around 720p AV1.
If I need to ensure whatever I am downloading works on some TV via a USB pendrive, instead of AV1, I will select the VP9 video stream (243 or 247 codes). Verifying quickly via yt-dlp -F URL helps.