Super wave vs nuwave

Hello, I am not sure of differences of these oven.. I would like to know which is the most reliable.... I almost ruined a really nice Standing Rib Roast for my CHRISTmas dinner due to the fact that my Sharper Image Super Wave Oven stopped about 15 minutes into the cooking process... Had to go dig out old faithful Nesco Roaster to finish it as my reg. oven is broke. So much for that. Now I won't trust this type of oven either... And after buying 3 different cookbooks too. Anyone want to buy my cookbooks? As this Oven in going back to ShopNBC. I was disappointed to say the least.. Only the second time I used it too.
Betty in Va.