I like Tri-X for its tonality, long density scale, strong sense of line, and even traditional grain pattern. It's a flexible film available in most of the formats I shoot. I process it in PMK for enlargement, ABC pyro for contact prints, and Acufine when I need the extra speed.
The others you mention are all very capable films. Try them all, pick the one that you have the strongest affinity for, and use it exclusively for a year or so to see what it can and can't do.
Delta 100 (120) developed in Pryocat-HD for highlight-control, fine detail and grainless rendition. APX100 (35mm) in Barry-Thornton's Metol 2-Bath for foolproof 35mm photography with in-camera metering. APX100 and FP4+ are to close together for my taste to use them both side by side. I do not use Tri-X.