all my 5g kegs 17 (?) are pins.
For me, it was an easy choice as the kegerator I have wouldn't fit Ball locks since they are taller.
That said, I think a lot of brewers like ball lock since they are taller and smaller in diameter - I know if I were using BL, I could fit 8 kegs in my lagering freezer instead of 6. oh well.
BTW, an awl on the gas poppit works just fine for me...