Which is better, MP3 or MP4 player?

This will depend on the format to use whatever means. Both players called MP3 devices (usually played only music files) and MP4 players (which also play video files 'mpeg-4') support various audio file formats. Between these formats are highlighted. ogg and. aac they get to have a higher compression rate than MP3, OGG files, for example, has the same quality of mp3 file half the size of these, and aac files (nar plus version) has the same quality of MP3 files but with one third the size of these