Angle blending vs masking terrain material

In terms of performance, what are the cost comparisons of using multiple angle blends (World Aligned Blends) vs loading a 4k mask into the material?

Material A- no masks, lower texture memory higher instruction count?

Material B - obviously, more texture memory on terrain

I don’t need any help setting any of these up, only curious about the performance before doing any profiling because I currently have a massive material using world aligned blends.