Well in the end it is about what you like the best, and it wouldn't be multich stereo just because its louder for me. The surround upmixers will send different information to the center and surrounds; the multich stereo will simply sum the L/R signal for the center channel and just repeat the L/R signal for each pair of surrounds. Whether you like 2ch content upmixed to surround is another thing, some like it, some don't. I like it for some stuff, but still listen to plenty of 2ch just as 2ch. Experiment with each mode with both music and various 2ch tv shows/movies, see if you find you have specific mode preferences....