We just faced that very decision between a 23-foot Globetrotter and an Oliver. We've loved our great little T@B for several years but have long-planned to order a roomier Airstream for retirement travel. But we just couldn't seem to bring ourselves to place the order. We were camping in Tennessee recently when we came across an Oliver on it's maiden voyage, then we made a detour to Hohenwald for the tour. On the way back to the Midwest the next day, we made it a point to swing by a large Airstream dealer to look at comparable Globetrotter and Caravel models while the Oliver experience was fresh. Sure, there were a few features we preferred with AS (mostly layout-related, maybe a few decor options) but the Oliver really stood out for it's fit, finish, and overall quality, especially against the Caravel. While Airstream advertises high MSRP, the prices dealers offered us were virtually the same as Oliver.
We got home, gave it a day, and ordered our Oliver. It was a simple decision once we found the right trailer--or rather, the right trailer found us!