i'm a C, which i would say was pretty average rather than small. But personally i think i'd rather be quite small chested than large chested, at least if you are small chested you can use a padded bra when it suits you, and when it doesnt you can use a normal one

whereas if you are large chested you're sorta stuck with them (in the sense that you cant just "put on" and "take off" boobs when you want to!), plus you have all the back ache problems etc.