Texture over porosity for me, hands down. But my texture and my porosity "agree," in the sense that both characteristics call for minimal protein.

I think things start getting real interesting when they don't agree, like a coarse-haired high porosity curly. In this instance, I would listen to texture and be very cautious around protein, always on the hunt for one that doesn't bother it though. If I were a fine-haired low-po, I would feed my hair all the protein it can eat and just work on technique so that it absorbs it, things like warming up products or using steam, opening the cuticles in general.

I think texture should definitely be catered to... one can always work around porosity.