Buffalo Trace is not technically part of the official trail (though I'm not sure why), but was our favorite of the four. The tour is free and first-come first-served and includes a tasting, and the grounds are beautiful and it is designated as a national historic place.
Four roses was under construction so we did not do the full tour, but we did the tasting. As a bonus, they let you keep the glass! We didn't spend as much time here but I'd like to go back when the tour is available again. This one had more of a spanish-inspired theme in the buildings and decor. Also, I had no idea that V-J Day in Times Square photo has a Four Roses ad in the background!
Finally, we went to Woordford Reserve the second day. We would have liked to go the first day, but you have to make a reservation ahead of time and all of the spots were taken when we looked the day before. This was our second favorite, though the tour is $15 a person, which was the most expensive of the four.
I'm already looking forward to our next trip! I'd definitely visit Buffalo Trace and Woodford again, but I want to check out the Louisville area distilleries too. There is also a Craft Bourbon Trail with smaller distilleries.
"Keep your friends close, and your bourbon closer" -old Kentucky proverb