I have the Wilko £13.99 roll and it's much sturdier than the poundland stuff I had last year. It's not full landscaping weight, but about the same as the chain DIY stores mid weight rolls which are easily twice the price.
We gravelled over a large area of my elderly mum's garden last year and when I was pricing up the options I noticed that there can be a difference in the width of the fabric, only 10cms or so, but over a large area, that adds up and changes the price model, so do check.