i dont see any help of numbers aiding you in any way for getting a kill. they dont help at all. this should be a simple choice. random numbers or bars that could mean life or death... i would choose life and death.
Indeed, why would you look at numbers if they don't help you what so ever?
Point being, numbers aren't of help, they actually just take up a little space, when the bars put the crosshair in the middle, which helps you aim, makes your shots more precise.
Though it's your call, your GP.
If it helps you, that's great