I'm definitely in the same boat in my love for stick tang HI models. I love the older lighter faster pieces.
I really don't see tangs breaking on these unless there is a flaw in the metal or something else. In the cases where they have broken, I feel pretty confident that's the culprit, maybe however, the nature of stick tang makes it more likely to fully fail in that circumstance as opposed to chiruwa.
Gotta agree also, that my perception is that the amount of metal is pretty much in line on both models. Having just spent the past two days forging knives from 5160 from 1/4" flat stock, it's pretty amazing how much metal there is once you start drawing it out. A 3-4" long piece of 1/4x1" can make a huge knife.
Here's my recent prized acquisition, a old Sanu YCS with plain handle, and Sarki Shop scabbard. 23.5oz as I recall, ultra lively, very choppy, and drop dead gorgeous: