comparing ps with psp

i was sketching the hair of the sin greed , and it just didn't come out the way i wanted it to come
so i closed psp and opend ps and tried it there..
and my surprise was huge, after one try, i had the hair i wanted, and i was amazed by the difference of the same size brush
i used the 1 pixel brush in psp, and it looked so hard and thick if you compair it to ps where it is soft and smooth
its like using a pensil 00 and a pensil 5....
i never would believe the difference was so huge untill i just saw it now