A2, in my experiences with it, and with my very limited metallurgical knowledge,
I see it as a nice all-around steel, I prefer 01 to work with, but A2 is pretty much the same place in quality.
I've only had one knife in A2 and it's held up for a few years now.
Being a borderline Stainless, it resists corrosion with no problem, just clean it up after use.
I can't tell ya much about comparing larger and smaller blades, for the reason I've only had one in A2.
Also, 01 is more easily available in different sizes if your referring to knife making.