I like the Beretta compact soft cases for convenient travel when simply grabbing a gun from the vault when it does not have a specified hard case that it lives in.
For far, it was John Hall two-gun cases hands down forever & stuck in the center of a US duffel bag w/clothes packed all around it and on the top and bottom as well. FWIW, I used golf club covers on the action ends to further protect them from airline abuse.
Today, I use SKB two gun cases for far travel, just as George says above, but still stick a golf club cover over the action. Does it really provide additional protection? Who knows, but I feel better doing it that way.