I like Tri-X for the look and tonality of Tri-X, and because even if the various versions of Tri-X aren't quite the same, I think of them as being in the same tonal family. The speed is an advantage sometimes and a disadvantage at others. My normal mode is to shoot it at 200 in PMK (160 for N-1) or 160 in ABC, but if I'm doing 4x5" handheld, I'll can process in Acufine and shoot at 640.

For slower films, I like Efke PL100 (around EI 50 in PMK) and for studio portraits Ektapan (until I run out, alas) in ABC pyro, also around EI 50.