Veins are favored over arteries because they have thinner walls, and thus they are easier to pierce. There is also lower blood pressure in veins so that bleeding can be stopped more quickly and easily than with arterial puncture.
I don’t have two things I have one I would lower prices because someone people are not that wealthy as others so when they get sick or catch something they can’t go get help because they can’t afford it they want to say help every body but won’t help people because you want get money out of it that is just totally wrong.