Bubbles in the rim are more understable, bubbles in the faceplate are more overstable
This is true in theory, but has not held out to be true in practice - at least inasmuch as choosing a Blizz disc is concerned. I have a couple of Wraiths that exhibit this exact opposite effect (and yes, there is a difference in plh). My Destroyer is all rim bubbles and more hss than a friend's which has bubbles in the plate (early edition)...plh and dome are the same on these two discs. Mine is marked 136 (scales 138) and his marked 141 if I remember right.
I think this tells me/us that the distribution of the bubbles doesn't really make much appreciable difference at all except in a physics paper.