I'd probably go for QF, especially if you can get seats in the front cabin (row 11-13). This minimises exposure to the general riff-raff in the main J cabin . You might have problems getting these seats unless you have high status.

Stopping in DXB and then having the long sector DXB-MEL will work well for sleep. I'd avoid anything that stops between DXB and MEL (if that exists).

Others may comment on the QF-EK comparison.