All the terms are subjective.
Celluloid smells like rubber-doesn't shatter while turning
Acrylic depends on the formulation, but is "harder" usually-probably the easiest to turn, but takes a long time cause it fights back
Polyresin is homemade and can vary widely-brittle as heck to "mushy" Depends on how it was poured. This has turned into my favorite material, as Dawn has a GREAT formula that turns easily and gives a beautiful result-but 'twasn't always the case.
Acrylester and inlace are two names for the same thing, I think-very similar to polyresin with lots of hardener-making it prone to shattering
Once they are turned and the scratches removed to your satisfaction, they will all hold up well. If you drop the pen, then step on it and ride it down the hall, it will scratch. If this is your version of "normal handling" you were meant to own a BIC. If you treat any of them with the same respect you'd give your watch, they will ALL be fine for life.
Hope this helps, and I am certainly willing to read others' opinions about my analysis. I also don't bruise easily.[
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