Here's the Fodera page:
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To my ears most of the variation is coming from the player. If you listen to just one sound sample all the way through, you'll hear variation in attack and volume - that's the player. How your finger strikes a string will effect fullness and you can hear that as well. It's difficult if not impossible to remove that factor from the comparison of neck joints.
Well all the clips sound great to me, even though you can tell a very slight difference in the tones between the BO and the NT. And even that is subtle enough to possibly just be because of a placebo-like bias from knowing which is which when you play the clips.
In a blind test, it'd be a real task to tell these apart.
Otherwise, the different construction can introduce different acoustic properties which can affect the sound. But I bet you could even those out too by just doing the BO in such a way that it's acoustically the same as the NT.
That's all just a long way of saying it doesn't make any important difference in the tone and it just boils down to how you build the thing. In my view anyway.
I prefer NT for cosmetic reasons mostly. And most of the time NTs have the acoustic sound that I tend to like (dead dead dead), though I don't know if that's just incidental to the NT's I've owned and played.
LS

