Double Oven… Is there any difference or benefit having gas or electric?

Electric generally bakes more evenly. But if you are taking a double wall oven vs. stove, you will go electric as 99% of all models built into the wall are electric, so price and choices are there. If you are talking a range with the addition of convection and now air fry, it helps distribute the air evenly, so does put them on par. I like the GE Café double ovens in a regular range, and they make a great all-gas unit!