that's not at all what I am saying and ut seems u r missing the point I am making. they don't AT ALL mean the same thing. to humans, they can interpret the same physical intervals in multiple different ways. that's the whole point I am trying to make . the other point is that in reality, those intervals never change, just the subjective perception of what they mean changes. this a completely abstract intangible phenomenon .You are extrapolating from the one very basic fact that their intervals are the same to conclude that that must mean they are the same thing. It doesn't, and they're not.
with regards to B major being the must robust sonically idk, but regarding it being the best for fingering I haven't worked with that key enough but I will try using it more often and see, some keys are just easier to play than others or they will end up yielding interesting results like Gb/F# since it uses all the black keys . but the "sound" of Gb also has an interesting aspect to it.