I like Whataburger, but seldom eat there anymore. For one thing, the closest one I know of is Tulsa, about 150 miles away. When I travel that far, I'm generally eating someplace more upscale.
To be honest, Whataburger shines when compared to other big chains. I just ate a 3/4 lb. burger from down the road 4 miles at a local greasy joint. Much better than any Whataburger. In my county and the county 5 miles over, I can name 4 joints off the top of my head, that are better than Whataburger and in the same price range.
As to Sonic, they're okay when they're on, which is seldom. I wouldn't eat a burger at DQ. They taste like soy burgers to me. A lot of oldsters love their steak fingers.
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DQ is not bad. Not great but OK. Sonic’s here in TX are usually OK. Nothing to write home about, but they’re usually consistent.
I ate at a DQ in Oklahoma not long ago, and it was not near as good as the TX DQ’s for some reason. Same thing with the New Mexico DQ’s. Weird.