I don't know about either of those papers. I use the white cardstock from PaperTrey. LOVE the stuff! Works amazingly with my Copics!
Edited to add that I just realized PTI was Paper Trey so I guess my post isn't helpful at all. Sorry! I wasn't sure what it was when I first posted.
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Mom to Adult Identical Triplets--a police officer, 3rd year medical student, and special education teacher
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