At most marathons, the full is the flagship and the half is the shorter alternative. At Nashville, the relationship is reversed. The half marathon is the event that Rock 'n' Roll Nashville is known for, and the full marathon is the addition.
Here's why the half is generally the better Nashville experience.
The course. The half marathon runs through Nashville's best neighborhoods: Broadway, The Gulch, Music Row, 12 South, and Centennial Park. These are the areas with the densest spectator support, the most live bands, and the most Nashville character. The half marathon finishes at Nissan Stadium after 13.1 miles of the city's greatest hits.
The full marathon's second half. After the half marathoners split off, the full marathon route extends north and east through areas that reviewers consistently describe as less attractive. One review called it "unattractive industrial part of town." Another noted that "most of second half of full marathon is down and out." The crowd support drops significantly. The neighborhoods are quieter. The live bands thin out. The hills continue. And the heat, by this point in the morning, has arrived.
The congestion. The marathon and half merge and separate at multiple points, which creates congestion issues around miles 12 to 14 when faster marathon runners encounter slower half marathon runners. This can cost time and mental energy for BQ-chasers, though it's less of an issue for experience runners.
The honest recommendation. If you want the Nashville experience, the city's best neighborhoods, the bands, the crowds, the Broadway start, and the stadium finish, the half marathon delivers all of it in 13.1 miles. If you want the full 26.2, you'll get the Nashville experience in the first half and a grittier, lonelier, hillier race in the second. Both are valid choices. But the half is the race that Nashville does best, and the reviews support that clearly.