An H-beam rod has no advantages over the I-beam rod except I maintain it's easier to manufacture.

I have some Lentz NASCAR rods, they are I-beam and they are jewels. Oliver makes I-beams, they are near to the top if not at the top. Crower makes a very nice I-beam rod, they are tremendously strong. There is nothing magical about an H-beam rod. I maintain they have stiffness in the wrong plane, and tend to be heavier than an equivalent I-beam, although that difference is fading fast.

Buy the best rod you can afford but don't be fooled by the supposed advantages of one style over the other.

R.