Trumpet, of course. My father taught me the trumpet is the king of the jazz combo. Trumpet always supposed to take the first solo in dixieland band. I've seen a lot of combos over the years, trumpet always has the biggest mystique and potential for excitement.
Going to see Dizzy many times when I was a kid I remember walking into the venue and seeing his trumpet sitting on stage on a little stand. I thought, "Oh shit, there it is!" I knew I was in for a thrill.
On the other hand, when a trumpeter fails to live up to expectations, or is overhyped, there's no bigger disappointment. Discovering a new jazz trumpeter to study and listen to is a special treat. Sadly that doesn't happen as much as it once did. It's so hard to play it well.