MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is a patented digital audio encoding format using a form of lossy data compression
Ogg is free and open bitstream container format designed for streaming and manipulation of audio, video, and other media.
Quality meg licensing
"In general ogg achieves better compression than mp3 which is a plus for things like download size bandwidth resource usage etc"
from question "Reading mp3 file for game development"
|Vorbis better quality||
"Ogg vorbis is better quality per meg than mp3 plus no licensing legal issues"
from question "What open source C/C++ audio compression options are there besides LAME MP3?"
|Vorbis better then||
"Moreover ogg vorbis is better then mp3 at all bitrates"
from question "Record audio in C++ with best compression regardless of quality"
"Of those three ogg would usually be smaller than mp3"
from question "Creating small short audio files with sox for android"