I've been to both the Prentice Cooper range (by Signal Mountain) and the Spring Creek range (out past Benton). I prefer the Prentice Cooper range--mostly because it's closer to me, but I also find that the target stands are kept up a bit better (read:repaired and replaced) than at the Spring Creek facility.
The pistol range at Spring Creek has just one distance--25 yards, I think--with some sand-filled plastic barrels at closer ranges, presumably for setting up your own target stands. Prentice Cooper, as mentioned above, has target stands placed at three distances.
Rifle ranges at both places are roughly equivalent. Both have 100 yard ranges, with target stands. Prentice Cooper also has a separate 50-yard range, with target stand, while Spring Creek has a dirt berm at, I think, 30 yards, without a target stand. One disadvantage to the Prentice Cooper range is that all lanes face due west, meaning that late in the day, you get a face full of sun while aiming at your targets.
One more strike against Prentice Cooper is the frequency of closures. Every Tuesday and Wednesday (which is good, because it's for maintenance), Sunday mornings (***?) and for frequent hunts on and around the property. Despite all that, it's still my favorite local place to shoot.
One big advantage to Spring Creek, though, is the bathrooms. While Prentice Cooper has a single primitive, doorless and odoriferous outhouse, Spring Creek has...well, a pair of glorified outhouse. This alone may make the Spring Creek trip worth it, particularly if you're taking along ladyfriends or new shooters with small bladders.
One last thing--"Dave in GA" is a liar. There is never any .223 brass to be found at the Prentice Cooper range. Particularly on Saturday afternoons. No .45 ACP, either. And if you dont' believe me and come looking for it, I'll beat you with my broom and bucket...