Until you've come to a solid understanding of one film and found its limitations, I'd stick with it. Is there anything about Tri-X that you don't like? Is it too grainy? is it too fast? too slow? Are you not getting the prints you want from the film you're shooting? If the answer to at least one of these questions is yes, then I'd look at switching film. But first, I'd look at improving your development and printing techniques before switching films. We are truly blessed in this day and age to have essentially no BAD film available. There are some better than others, and some that are special-purpose that don't work well outside of their intended goal, but really no BAD film.