Price wise, MP4 is a bit more expensive than MP3. Sellers tempt their customers to buy MP4 instead of MP3, so that they can gain their profit margin. The introduction of MP4 has brought the price down of MP3, and sellers hardly make much. Now the capacity of either of them also matters to the end-users. Let’s leave this choice to them.

There was a time when MP3 entered the market and became a huge success amongst the end-users. Later, MP4 entered, and was well accepted too. The only difference between these 2 is that, on MP4, one can watch a downloaded film on their tiny screen and also listen to music. Whilst on MP3, one can only listen to music.