A lot of opinions here. Some from experience on a personal level (Me) some from someone who has done many, many engine builds (DT Hemi), others just quoting what they might have heard. I read a lot. I talk to many people I feel have a good handle on the subject. From what I've gathered gram for gram a H beam will be stronger if the same material is used. The material can be placed in the higher stressed areas with out adding unneeded mass. I suggest talking to Tom Molnar personally. He designed rods at Oliver for many years. My bet is he knows more about rods than most. I agree with DTHemi. Most rod failures have either grabbed a bearing or broke a bolt. I also run extra bearing clearance to combat flex. So far zero rod/bearing failures with my builds.
Doug