Ratings for double wall ovens are located on review blogs or official online stores like Amazon.com, the latter of which lists them from highest to lowest rating based on customer reviews. As of February 2015, Amazon lists 31 different wall oven models from a variety of brands.
TopTenReviews.com has a list of their top ten double ovens of 2015. The models include ovens from Electrolux, Frigidaire, GE, Kenmore, KitchenAid, LG, Maytag, Viking and Whirlpool. According to advice given on this listing, gas double ovens are more energy efficient than electric varieties, while electric double ovens tend to cook food more evenly and preheat faster. TopTenReviews also advises that customers look for the kind of oven style they need when making their purchases. Because of the differences in configuration, a certain size or shape of double oven may work better for a given kitchen than another model would.
ConsumerSearch.com has a review listing posted on August 2013 that lists several double wall ovens that are rated superior to other models. This site references Amazon.com's products, tending to rely on the customer reviews found there when comparing and contrasting the products. Out of the products they list, GE double ovens make the top of their ratings for 2013.