While I do not have graphs and exact measurements for diameter/density for both to back up my claim, after a $5k lasik operation, my eyes are deadly accurate. It got to be 20/20 or better. Just like headphones and amps, "they" do come in all shapes/sizes. It all comes down to personal preference. I don't believe that bigger is better. That's why I still love my little E09K ... until the big a.. Emotiva comes this Friday.