Electric ovens are the more preferred cooking system. There has been more advancements in electric cooking systems. Such as convection and microwave convection combinations. Other advancements include electronic clocks and timers with combination cooking systems such as microwave, thermal and convection cooking. A Convection oven is a more desired oven for the serious cook.
Convection ovens have a forced fan circulating hot air enabling food to cook faster and more evenly.
Baking is preferred in a convection oven because the oven will have more racks to slide more cookie sheets on. In addition the evenness of the heat creates a more even baking system. Check your local codes for gas wall oven installations. Most jurisdictions require a shut off valve and a flex line installed on your new oven. Electric ovens are powered by an electric cord which will be hard wired.