I have grown Opalka, a few San Marzano varieties, and maybe 15-20 other paste varieties. Not an exhaustive list.
As of now, our
Marzano Fire seems to be faring well in comparison to other paste varieties.
It seems to be much better than average at avoiding BER. And Tomatoville consensus seems to be starting to suggest that it is pretty good, particularly in cool/marginal growing conditions.
It is our go-to variety and we are happy enough with it to have stopped trying to develop another paste tomato.
It is an OP.