I would personally go with a double oven, but that’s because my wife loves to cook/bake. We currently don’t have a double oven and there were plenty of time where my wife said she wish she has another oven so she can bake 2 things at once. WRT the microwave, I’d go with flu and not go w/ the built in. I have a special cabinet/shelf combo that I can put the microwave in (it shelf part was specifically made for counter top microwave), that way, the microwave doesn’t take up counter space but it’s cheap to replace if it breaks.
