In stead of hiring a car and driving back from Dallas to Houston I took the FlixBus. The FlixBus was the best option with regards to their timetable and it is cheep. It is amazing that they can run a bus for hardly anything.
The bus was ok and even though we had quite some rain it ran pretty much on time. The only complaint I could have were the bus stops... Other than some sand (or mud in Houston) there was nothing there!