One reason is because it is a central area. The Sunday course is only 12 miles from the hotel in the other direction. There is not much to do in the area of the Saturday course and the "night activities" are close to the hotel.
Guys, this is DFW. The course we picked is south. The course on Sunday is more central. There is not much surrounding Tangle Ridge except homes. Arlington is central to everything. Yes, it will be 20-30 minutes to Saturdays course, 15 minutes to Sundays course, 10 minutes from DFW airport, 15 minutes from Saturday nights restaurant, etc. But that's the city for ya!