I like Whataburger alright. We have 2 locations in Lawton. When I first moved to this area there were four locations in town, then 3. Now just 2. The burgers there are really good. But I just don't use the drive-thru lane; I always go inside to order. And that takes long enough as it is.
It has been a couple or so years since Five Guys opened a store in Lawton. It's in a building on Cache Road shared by Jimmy Johns and a Red Wing Shoes shop. A new Firehouse Subs store opened next door last year. It's within rock throwing distance to Jimmy Johns. I've been to that Five Guys store only a couple or so times. Just down the street there is a S&B Burgers restaurant at 38th & Cache Rd in a former IHOP building. S&B is based in OKC; they make some really good burgers. Wayne's Drive Inn is a Lawton-based burger joint that functions similar to Sonic locations. The burgers are better and their 2 stores have big green and red neon signs. Burgess Grill in Downtown Lawton is another popular local spot with good burgers. The Meers Store out in the Wichita Mountains is a popular tourist spot. Their burgers used to be awesome, but I think the place has gone downhill over the past 20 years.
In-N-Out would just kill it if they opened a store in Lawton, despite all the other competition with burger-oriented restaurants. But Lawton probably just isn't high income enough for In-N-Out. They're leaving money on the table not opening any locations in Oklahoma. OKC, Tulsa, Lawton, Stillwater, Norman, etc are all within reach of the In-N-Out distribution center in Fort Worth.