ZLZBlack Biker Jeans for Men, Slim Fit, Comfy Stretch Ripped Distressed Biker Pants, Designer Jeans

So, i wear wrangler advanced comfort which is 32x30 but i also wear Levi jeans which is 38wx32l so which size should i get for these?

Im 5’6” and slim what size should i get?

On the style titled "Black01" the frayed sections on the knees, are those holes all the way through or just surface distressing?

My son is 6’4” 240 pounds. Should I get a 38 or 40?