They're pretty similar. Mt. Juliet High has an advantage in terms of aggregate achievement levels, since the affluent areas near the lake are in that zone; Wilson Central's zone is somewhat more rural by comparison, and you know how scores tend to follow socioeconomics. But in terms of things that will directly affect a student, there's little to differentiate. The buildings and facilities are similar and relatively new, similar course offerings (regular and AP), both are good-sized schools with the usual range of extracurricular activities, etc.
One peculiarity is, because of land availability and/or slightly missed future growth projections when the schools were built, neither school is ideally located. Mt. Juliet High is barely in its own zone and Wilson Central is kind of in the middle of nowhere.