If you prefer listening to music on MP3 player and smaller file size, use MP3. When to use MP3 or MP4 depends on what you are using them for.

But why the popularity of the MP3 format has not abated because of the wide usage of MP4 format? As a matter of fact, although being often used as the alternative to MP3 format on Apple devices, iTunes, MP4 is not a replacement of MP3 on players and in computer as an audio format.

And MP4 is used for various purpose, like streaming videos even audios, encoding videos. Videos in MP4 format can be played on a large array of multimedia players and portable devices. MP4 is a file format used to compress files losslessly, producing better audio quality. While MP4, a newer file format, deals with audio, video, image and text, which differs significantly from MP3. As I mentioned before, MP3 handles only audio. However, low audio quality is MP3's biggest disadvantage. Moreover, the legal status in some countries remains unclear. It is also more compatible, works with almost all music players. MP3 has lower file size and not fixed compression ratio, which means that you can balance between file size and audio quality.

Best mp3 to mp4 converter