I got what I wanted-I'm just learning this now, and yes, I did buy all full chisels in the last 2 yrs, going for speed without realizing the trade off.
I will buy a semi for dead/dry solid wood (not the punky crap) that's very rough on a full chisel chain, and then use full chisel only on the clean, green wood.
And I also just learned that a skip tooth chain is best for my 33" bar, and will also get that in a semi. It's rare that I'm cutting huge live trees. I've got a massive hickory now that I need to take apart and that'll do it for me.
So, the gain I'd wondered about is clear-on clean/green wood, the full chisel is fast and will hold up. On less clean or hard/dry wood, the semi will hold up longer and even last longer while cutting, thus, giving me less fits.
It's all coming clear now...