Response to What is the difference between Tri-X and Tri-X Professional?

Although I haven't paid much attention to Tri-X, I believe these are the differences:

TXP is a short-toe film with a fairly straight-line characteristic curve; this means it has higher shadow contrast, pretty much no underexposure latitude, and higher highlight contrast. I believe it also has a retouching surface on the base side, although that may be of no interest.

TX is a moderate-toe film and has a shoulder in the high end of the curve; this means lower shadow contrast but some underexposure latitude and lower highlight contrast.

They are definitely not the same emulsions.

Which film works best for you will in part be determined by what paper you're printing on; TXP may print better on a long-toe paper such as Ilford MG IV RC while TX may give muddy highlights, while otoh TX may print better on a shorter-toe paper such as Agfa MCP while TXP may have hard-to-print highlights on that paper.

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