My system is a 4.2.4:
Golden Ear Triton Ones for front L+R with their subs wired separately as my second sub
Golden Ear Triton Sevens for rear L+R
4 Golden Ear Invisa 525's in ceiling
SVS SB-3000 as my primary subwoofer
Sony "5.2.2" system (with a Sansui QS-800 in the mix) and full 5.2 for other DTS/DD needs. Who needs more than 9 speakers in a "surround sound" system anyway?' Default' is 4.1 for phono with a QS-500 functioning as a 'rear amp' and quad decoder connected to a switchable Sony TA-N110 outboard amplifier (three inputs) for additional speaker settings. A formal 'tape loop' function does not exist with a Sony STR-DB940, although it has more ins and outs than most folks will ever use!
I voted 7.1.4 with back speakers, but it is actually 7.2.4 as I have 2(3)subs. All never AVR's can use and calibrate 2 subs. If you use front wides the designation should be 9.2.4 as the wides usually are floor speakers.
7.1.4 Atmos or 5.1.5 Auro 3D with VOG center overhead speaker. The second sub output on the Marantz SR7013 feeds the amp that powers the Auro 3D VOG speaker. I do not need subs given the ultra-low WAF (a euphemism for really #@$%in' big) of the mains, center and surrounds.
I'd love to go to a 7 channel base system but my room just won't support the extra speakers. In any case I'm thrilled with the sound of my rig as is, IMO it sounds amazing when playing the latest Atmos mixes or the many classic 4.0 recordings.
Long Live Multichannel Music!