VBR MP3s compressed with the latest LAME (parameters -q0 -v2) when packing music that I might give off to friends (that rarely have Vorbis compliant MP3 players).
Vorbis at quality 6.3 for myself - for those tracks that I estimate nobody but me wants to hear. 
I’m a habitual Vorbis user. Started using it 'round the early part of the last decade.
