I have Amethyst Falls wisteria and Campsis radicans (Trumpet Vine) growing together in some areas. They do fine together but if you are talking about a Campsis radicans you might want to think twice before planting it. It's one of the most invasive plants I've ever dealt with. I spent almost 10 years trying to kill it before giving up. Now I just try to keep it contained. It is beautiful in bloom and hummers and insects love it. The Amethyst Falls wisteria isn't as aggressive as the Oriental varieties. I'd think that either of the vines would take over a pergola in a very short time.

Pam,
Plant a wisteria. Even the chinese kind, which is extremely fragrant and grows like a weed, is much better to have than a trumpet vine.
If the wisteria gets out of hand, just cut it down, all the way down in the spring, it will cover your arbor or pergola in one season. (it's like a snake, freaky)
If you plant the wrong kind of trumpet vine, you will always have it because it has invasive roots that travel underground like bamboo.
Personally, my vote is for the wisteria. Can't beat it!
I have the chinese kind, it fills the yard with tremendous fragrance and if you keep cuttine it, it will keep blooming.
If you buy one this spring, make sure it is blooming when you buy it. VERY important.

Pam why [make sure it is blooming when you buy it. VERY important]? PLEASE ELABORATE.