Dermarolling vs Microneedling pens for shaved heads

[pelonweon]

Hello,

I wanted some input from folks who have used both micro needling pens like Dr Pen as well as Derma rollers on a bald or shaved head.
I am trying to decide which would best for me.
I don't care about pain or price but I am worried about scarring, bloody appearance or leaving nasty puncture wounds on your head as I do shave my head every other day and I am pretty much bald on my crown.
Considering that I wear a shaved head - which one would produce less noticeable wounds?

 

[Nostro300]

What I noticed is that dermarollers have much finner/thinner needles which is good to cause less scaring. I bought a dermapen because my hair would get stuck on the roller of the dermaroller. What I also noticed is that the dermaroller needles get bent easily (maybe cause i buy the cheap AliExpress ones) and the dermapen doesn't but it doesn't surprise me because the dermapen has spikes rather than needles.