"Setting file size aside when considering the better format, MPEG2 wins hands-down, as it provides a far superior image quality. The difference in quality is minor when viewing the files through a tiny screen, like those installed in mobile phones and even netbooks, but when it comes to large displays, like most current HDTV displays, you can clearly notice the difference in the final picture. We can attribute this to the amount of data lost, since both MPEG2 and MPEG4 are compression methods that lose data. MPEG4 simply discards more information, which results in poorer picture." Read more: Difference Between MPEG2 and MPEG4 | Difference Between | MPEG2 vs MPEG4 http://www.differencebetween.net/technology/difference-between-mpeg2-and-mpeg4/#ixzz3zpFKe0Dj
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