Dallas is worse, depending on how you define "aggressive." (i live ~2 hours from NOLA and ~5 away from Dallas.) During rush hour i traffic break and Dallas and Vegas have the highest ratio of people that will do the "cut you off then brake because there's only 100' of runway, there". NOLA feels like inept drivers (oblivious is how i describe many Louisiana drivers, in general!)
I was living in Vicksburg as a kid, so the three big cities we would visit were Memphis to the north, New Orleans to the south, and Dallas to the west (skip Shreveport). And…I have no memories about crazy drivers cutting lanes like they didn’t exist in Dallas or Memphis.