Here's my testimonial about this:
It depends on my source. However my particular AVR does no allow for a stereo "A+B" front and back. It forces the dadgummed center channel on me when using it's DSP to augment from Stereo to more speakers.
My solution to this is to use Foobar with a 4 channel conversion DSP and Flac to create "mirrored stereo" files in 4.0 ch PCM. I usually play these using an Oppo BDP-103 or a PC using Foobar as player.
I have four matching 8" 3-way floor standers hogging all my living-room space for that very purpose. Spent my teenage years with receivers hooked to 4 speakers, and I can't shake the habit. To me, for studio music, it's like being on stage, in the middle of the band/orchestra as they play. For live performances, it's as close to a stadium atmosphere a stereo recording can get me.
Few receivers offer A+B on top of being 7.1, but some do. If you can afford it, you should audition such a receiver, you may fall in love with this particular listening mode.