I can't remember that we've ever taken 331, but we've worn a pretty good path down 231 since we have a son in the Air Force at Panama City. Most of 231 is 65 mph divided four-lane and very few stoplights. Major towns along the route (traffic, lights, slower speeds) are Troy and Dothan. I would recommend using the bypass around Dothan - we typically use the western half. There is a Camping World in Dothan on that half of the bypass in case you need a few items from there.
Florida has a nice welcome center at the Florida line if you need a break before I-10. There is a Love's truck stop at 231 and I-10.