I do not know enough about what makes a good neg for scanning. But (to name only one name I can remember) look at the images posted on this site in the past by Brumellisa to see what 4x5 Tri-xP and D76 can look like.
Thanks John. I use that combo quite often (actually, I prefer d-76 1+1). So would only need to look at the prints in my hallway.