I used to use Ubuntu on my netbook years and years ago, until I came to the conclusion “dammit, at this point, I would have had easier time if I had just installed Debian to begin with”, and installed Debian

I would say for a out of the box and for a beginner is mint way easier than arch. Try to explain your grandma what a kernel is and how modules work in there. Mint autoinstalls every printer driver and co. Arch doesn’t. I use arch btw at home but I would never install it for a beginner