Hope I understand yer question correctly...

If u eq/ efx... a wav file of the total of the 6 channels u spend less cpu power but u have less flexibility if u find that something isn't perfect (ex. u might find later that one of the sounds iis a bit 2 loud)...

If u bounce each track individually u have loads for control and u can have diferent eq/ dinamics/ efx 4 each make the summ as great as u want!!

Z