The difference between ogg and mp3 is the license,
in the first place ... mp3 is copyrighted by the Frauenhofer
institute in Nuernberg, ogg is gpl'ed... the "quality" of
the encoding (lossyness) is depending on the settings
you choose ... you can create either with very high
bit-rates ...
And it doesn't get much more "point & click" than
grip for all I know :} ... but have a look at
http://freshmeat.net and search for "ogg encode"
and "mp3 encode" ... maybe you find something
more to your liking...
Cheers,
Tink