The first one is Art 300 and the seccond one fibre paper.
Since I am not sure if buyers know the name Ilford ART 300 I just say pure cotton base paper.
I also don't know if buyers know what I am talking about if I say "Silver Gelatin".

So I say the way it sounds understandable to anybody.

Edited... What I say above is that I offer print on two type of paper. I am not saying that I print with Art300 that have fibre. It doesn't exist.