My favorite is Ilford 125 (in 35mm, 120, and 4x5), but am getting fond of Acros 100 especially in 120. I've yet to get a roll of Tri-X shot, but am getting ready to test a few rolls in 35mm for a project where it seems advisable.
I'm really on the fence with it comes to TMAX 400, I shoot a lot of it, and like how easy it is to scan, but haven't decided how I feel about it. This is part of why I want to get Tri-X a try.
I also use Delta 100 (for some reason I seem to have an excess of it) and though it barely counts Ilford XP2.
I am getting ready to give both Kodak and Ilford 3200 film a try for a project in a couple weeks. I'll either use it, or push Tri-X or TMAX.