AAC is typically the default for streaming quality and compatibility.
AAC offers efficient quality at lower bitrates and broad playback support across modern clients.
Use MP3 where legacy ecosystem support is the top constraint.
Use Opus for low-latency interactive workloads and bandwidth-sensitive delivery.
Use M4A when you need MP4 container features for metadata/chapter support.
Evaluate classic MP3 versus AAC for streaming and mobile playback.
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