The regular soft buck rivets, are fine.
They have held the Airstream shells together for over 75 years.
Lack of proper running gear balance has been probably the great cause of sheared rivets on an Airstream.
For exterior replacement of sheet metal, the Olympics are perfectly fine. They were extremely tested in the early 70's by Caravanner Insurance Company, the old insurance division of Airstream, and found to more than adequately satisfactory to replace the buck rivets.
The soft buck rivets are used in production, since they are extremely cheap and do not need to be shaved, which saves a ton of labor. Shaving olympic rivets can take more time than installing them. The simple secret is to add a small bead of Vulkem sealer, underneath the rivet head, before it's inserted into the hole. Plus the cost of one Olympic rivet, would buy at least 100 buck rivets, if not more.
Some dealers, may down talk olympics so they can charge the owner and/or insurance company more money to gut part of the interior, so that they can install buck rivets.
If the Olympics did not do a good job, considering proper installation, Airstream would have outlawed them, back in 1971, when the Dupont explosive rivets went off the market.
Life being what it is, some folks have a problem using a rubber band.
Back then, Caravanner Insurance more than adequately proved the effectiveness of the Olympic rivets, since a few dealers insisted on using buck rivets, so that they could charge more money for the job, and would say that the Olympics were no good.
Almost sounds like that old myth has somewhat come back to the surface.
If the interior is going to be gutting anyway, then use the buck rivets. If not, use the Olympics, but with some Vulkem sealer behind the rivet heads.