I have a lot of foreskin, but yet, it is easier to jelq with KY, more freedom in the hands. I only have to focus on the grip not if my skin is stretched or if am putting more force on the skin than needed, or if I am being brutal or or or or or or or or or. Nothing. Plus it is for sure easier for the skin and being a beginner I prefer the easy way while I am getting stronger there.
And, yes, dry jelq causes more friction than wet jelq and anyone who says the opposite is just not using right lubrication.
I’ve always done dry jelqs, and I have a stretch mark from it. But it’s hardly noticeable and on the underside of my penis. I’m not a pro at this, but I would recommend to start with wet. I think it might have been worse if I was uncut.
I’ve started to use baby oil for my wet jelqs, it works great.