My first experiments with HP5+ were conducted using Kodak's TX times (35mm) in HC-110 (B). Overdevelopment city. I was lucky they were low-scale subjects.(posted 8691 days ago)My second run of experiments began when I had decided to switch to Rodinal. Not a good match. Rodinal proves that with HP5+, an ugly thing is not a joy forever.
Speedwise these films seem to be the same in HC110 and TMax. My experience is that they're the same damn film that just reacts to developers differently. I couldn't pick a TX print from an HP5+ print -- except for the fact that I only used TX in my Fischer Price camera, so that I know that prints with terrible quality in the lower right corner are TX...