i just finished a project where i wanted a very unique grain pattern. i tried 4 different combinations HC-110 (which is my std developer so this was the 'control group'), one of the FX developers from the Darkroom Cookbook, Rodinal, and Ethol TEC.

Ethol TEC was my final choice because the grain was very distinctive, it almost gave the effect of an etching. My second choice was Rodinal, the grain was distinct and very sharp.

I have some work handy of the Tri-X Ethol TEC around the house if you want I can scan it and send you a sample. I may still have the test prints from the rodinal at the lab, I can try and get them tomorrow if you want.