Quill work

I've decided to take the plunge and am going to start working with the quills. I'm hoping this week to get some greens and purples dyed up as I'll be renewing my indigo vat, probably on Monday.

I have two pieces of braintan, I"m not sure if it's deer or cow to be quite honest, one is smoked - the tan stuff, the other is not, the white piece. Anyway I'm wondering which piece might be a bit easier to work with for the first time. The white piece while quite thick is very soft and supple.