Interesting... I think we may get some opposite results North vs South.
We have grey mold here and early blight, leaf mold during humid hot weeks of the summer, and we have the mildews L. taurica and the other one as well, depending on conditions.
We don't have the soil borne diseases and don't have Septoria either.
So.... Malachite Box did great for me here. Big healthy plant, produced lots, endured cold and heat. Definitely not the first to get the mold ( yes they will all get it eventually in the fall).
Another one I was afraid about, Pink BTD is often named as a mold magnet, but it really did fine here the year I grew it.
Maybe there are different strains of grey mold in north and south as well.
