Personally I would opt for M-touch oven, as it would be a good combo interface-wise as well as functionality-wise to a combi steamer. Miele as a whole has much wider offering in electric oven compared with limited selection of gas oven. So 30" duel fuel gets my vote.

If it were me, I would opt out of Miele altogether, but particularly for the range. Look on other forums, they are really bad. Sadly, I know from experience. It took about two months of back forth to get a "working" unit. But even working, the oven settings are off, and the Grill catches on fire with any steak, and burners are slow to light.