This is a good thread.
Like many, I have used HP5+ for a long time and find it to be an excellent film. I do not find it similar in many ways to Tri-X, but that is OK for me. I was just testing HP5+ today with Rodinal 1+50 and found my EI to be 640, which is exactly the same as when I develop it in DDX. I use a Jobo Expert drum on a Beseler motor base and I think the agitation causes the film speed increase. But even at 640, I find the film to be excellent.
As far as the "modern" films go, T-Max is a fine film but not for me. I am just not precise enough with my development tempretures to get it right. Sexton does but as Steve pointed out, he is usuallly photographing in shadows or low light and he has it dialed in. I do use a lot of Delta 100 which I rate at 200. I find it to be a great film and DDX is a wonderful developer with it. I don't think it is quite as difficult to process for a clod like me as compared to T-Max.
But, if you are really looking to change I would go ahead and experiment with a few films you are interested it. Test them, work out the kinks, get to know them a little and that way you will have options as opposed to being locked into one film. It may cost you a few dollars more to do this, but in the end it might be worth the extra time and money just to see which ones you really like.
Good luck.
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