HELP ! what to use 904 - 727

Out of my 6 small block Mopars, four were running 904's and two had 727's - none of the transmissions had any modifications. The only trans failure I had was with one of the 727's. It was in a 71 Challenger with a lot of engine mods and had been driven really hard, so I wasn't surprised when it finally let go. I've asked the same 727 vs. 904 question myself and have been told by some very experienced and trusted members that the 904 is a strong little tranny that will take some abuse, and it has a slight weight advantage over the 727.