We (me really) recently redid our kitchen. (I built the cabinets from cherry via a SMC source and did all the other plumbing, electrical, flooring, drywall work myself. But that s not wt you asked.)
We chose a Kitchenaid Dual Fuel range with two ovens. The cooktop is gas, the ovens are electric. The larger (bottom) oven is convection. It has been in service now for about 8 months. Dual ovens was a good decision for us. You can do two dishes at the same time at different temperatures. We use that feature! Not all the time, but it is available. Depending on the height of the dish, the top oven gets used since it heats up quicker. We have never encountered a size restriction with the lower oven.
Good luck choosing,
Ted