I guess u didn't understand ogg...ever heard of RTFM? Ogg at lower bitrates allows for same quality and less filesize. Try to encode song in 192kbs with mp3 and then encode with ogg at 96kbs (or 92 I don't remember) and see that filesize will be smaller, but quality will be the same. If you're paranoid then encode with ogg at 128kbs
P.S. Really read docs...before you say something