The flat-bottomed airfoil is probably a bit more fool-proof. The nice thing about BUSA models is that you can almost pour the kit out onto the building board, throw in a couple bottles of CA and you're done.
But then it seems to me that an awful lot of people end up spending time doing a serious kit-bash to try to bring these more into line with scale. Sort of like the folks who take a perverse pride in converting a Guillow's kit to RC!
