Ultimately I have (2) 5.1 systems, so I will never listen to 7.1 and depending on the format and what system I listen to will serve the situation for how and where I listen to different applications....
On system 1, I have 5.3 with all monopole speakers so 5 channel music sounds much better but I mostly listen to 2 channel audio....
On system 2, I have 5.1 with dipole surrounds. I don't care for multichannel audio with that type of surround speaker, so I strictly run 2.1 for music.
Both systems do HT very very well....