I go with Garchomp. It's design is very cool and beastly! It fits me STAT-WISE, being the fastest out of the others. His movepools might not be as colorful as that of Dragonite but I really don't need more than an Earthquake and Dragon Claw/ Outrage.
I think it's Cynthia's Garchomp that made me go all "WOW!" On that Pokemon. It was extremely difficult to take it down for me. The Anime counterpart also showed no mercy when sweeping members of the Elite 4. I love that Pokemon...always a part of my team