My favorite is one I can find! I do enjoy trading tb's so I guess I prefer ammo cans with some room in them, but some of the most creative caches are little ones, and I like those a lot too. Really though, it's more about the location. . . going for a nice hike in the woods and crunching freshly fallen leaves, or hearing birds chirp as the form bonds in the spring time. . . that's a major turn on for me-even more than the smiley!