
I have had gravel for over 12yrs, not a problem, killed off the grass, laid damp proof membrane, edged the borders I wanted to keep with 6 inch high pressure treated boards and stapled the membrane to border side of boards to stop gravel going underneath, pricked all over with garden fork, concentrating on any areas where water collected[ several weeks before I got gravel to allow dips to become obvious] then ordered 6 tons of gravel and got a friends son to come and help me transfer from drive to back garden in buckets, I filled and he carried, took several hours but so rewarding to see when done.
The only area paved is under the pergola I added later for a garden bench to sit on. I rake the gravel over periodically, once or twice a year, where the membrane overlaps the gravel can get between the two layers. My Mums dachsie would find creepy crawlies and dig trying to find them but none of mine or the spaniel did this.
I got lots of advice re size of gravel from firm who supplied it, too small and it will get tramped into the house,too big and painful to walk on for humans and dogs, I went round locally finding what I liked and the size of each option and then went online to find the cheapest including delivery, I could probably have managed with 1 ton less but thought it would be better to have too much than not enough allowing the bright blue membrane to show through, coverage amounts seemed to vary from firm to firm.
I thought about paving but it was going to be more expensive, more preparation and I wouldn't have been able to do it myself, weeds would have grown in the cracks in the sand the slabs were bedded on.