I like a wall oven, and in our house we have a single 30" wide electric Maytag wall oven. Most wall ovens are thin, and if you do any serious cooking, you have to watch to make sure the pans you buy fit. At our prior place we had a gas range with a wide oven, so when we looked for a wall oven, we wanted something that would accept our current supply of pans, and the selection of wide wall ovens is limited. To be honest, we didn't consider double ovens so there may be a wide selection of wide double wall ovens.
Having homes now with a gas range with a gas oven under, and an electric wall oven with a gas cooktop in a counter, the gas cooktop, and electric wall oven are superior. I grew up and learned to cook on gas stoves, so I just know how to cook with them. That's something I never get right when I vacation somewhere with an electric range. The instant change of temperature that can be done on gas can't be done on electric. I know people that have the opposite feel with gas than I have, so I think that's a learned skill.
Back to the ovens, the electric and gas ovens are similar in function and I don't believe there is any real difference in cooking with gas or electric ovens. I prefer electric now, since I can broil in it with less risk of the foods catching fire. The wall oven is so much more convienent since it's at eye level. Ours has a light inside, but it's really not needed except when making cookies and cakes when opening the door ought to be avoided.
You might want to consider a convection oven. They really cook foods fast, and I often wish we had looked at a few of them before we choose ours. But we've been happy with our Maytag oven, and it's never had a problem in the 12 years we've had it.
Our cooktop is a Jenn-Air gas. We wanted the ability to grill indoors. The gas doesn't compare with the electric Jenn-Air grill. The vent sucks all of the heat from the gas burner outside, and it doesn't cook right. So we only use the regular burners, and rarely use the downdraft vent. With the electric Jenn-Air, the burner is in direct contact with the pot, but with the gas the flame is what heats the pot. So with the gas Jenn-Air, the downdraft in the center of the cooktop sucks the flame toward it and steals the heat. Perhaps if I tried it more, I'd understand it better, but my feeling is if you want a Jenn-Air cooktop, go for the original electric and skip the gas.