J. D. I was thinking about some of your exchanges with Justin when I wrote that this morning. When you read the thread straight through, at least when I did, what becomes most obvious is the passion that underlies the messages. This relates back to the nature of mankind. I apologize for singling you out, even without naming you. We all have some passion for this craft, and our own investments in it, and I know too well how hot that passion sometimes burns, and how quickly it can wane. I didn't mean to be critical of you, don't consider the observation to be critical even. Passion, generally, is a good thing. Rather that it exemplifies my point. Humans are a passionate lot, and this topic seems to stir deep.
Fact is, IMHO, it's a trick question (what's the better bow wood). The only answer is "it depends." And appeal to authority, or antiquity, doesn't expand our understanding any more than ignoring the lessons from antiquity or from authorities.
I usually use osage, because I'm butt deep in it, and usually the knarly, misshapen crap. But I sure as hell wouldn't spend $200 on a stave, even $20, if I had other timber readily at hand. I swear I think theres as much variation across specimens as there is across species in many cases.