Personally, I am a Hellman's fan. I have tried Miracle Whip and Cain's but always veer back to my old standby. After reading this article I am dying to try Duke's, but it's so regional I might need to order it online. But! It's one thing for me to try it, quite another thing to introduce a new flavor to the household.
But if Ina Garten likes it as much or better than homemade, who am I to argue?