For My Primary Sharpening System, I use two bench hooks one in plywood with three small cheap diamond stone (coarse, fine and extra fine) and the other, in pine, has a gullet for a Stanley combination oil stone and other for synthetic diamond stones ( also coarse, fine and extra fine).
||* (on the left) 3 water diamond stones cost about ~7.42€ each.* (on the right) 1 combination Stanley (came with the guide for about ~15€) and the synthetic stones a set of 3 for ~9€.|
The coarse from the synthetic is more aggressive than the coarse from water diamond stones, I use it for make the primary bevel, other than that I prefer the water stones because they are in metal and do not bend. The Stanley is a oil stone and I use it to polish the bevel at the end.