400TX is my standard 35mm black and white film, but I have used a bit of HP5+ sheet film. It is difficult to compare such widely differing formats, but my impression of HP5+ is very good. These are quite different films, however. Try five rolls or so, and see what you think. In tests, HP5+ shows outstanding tonal separation - better than Tri-X, but it may not show up in the prints. One of the outstanding qualities of Tri-X is the subtle differentiations it gives in the midtones. I like its look. HP5+ is different - not better or worse, just different. It looks a bit more bland to me, but that's me.