Order one M2 and one QS4 and do some testing and then let us know your results \:\) I will add if you have 4' or more behind you then I say M2 less than 4' go with QS4, just my 2 cents.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70