I think showing as an adult is so much more satisfying; I can plan things out, I can be organized and relaxed. As a child, it was always like "Oh, we're 30 mins late, and of course Sara forgot her breeches... "
Now, if I think my horse needs to come way early and look at scary things, I can plan that into my day. As a child, I wanted to win; but now I just go to have an outsider judge my progress and give me some new ideas to build on; it's peaceful. I have the funds to really make him look great, etc. Its way better :)