SO I know horse hide and shell and latigo are all good, but when it comes to making a strop are there any special considerations besides smooth and flat? I was looking at leathers today and there are so many textures and types and what not that I kinda want to experiment. Is there any way to go wrong other than cupping/too rough?

Is there anythign specific to look for? ie. Fill in the blank: something might not be bad for the razor, but if it doesn't have __________ (insert trait here) it won't work well.