You may get an extra 1/2" diameter with the 2-blade, but your cutting surface goes down signifiicantly (3 X 0.75 > 2 X 1). I have not heard of opening problems with the 3-blade before and that would trouble me a bit. I went with the 2-blade after much consideration for one reason only... everyone who has used them seems to like them. So far, I like them as well.