Gravel + stabilizer

I don’t have personal experience with this product, but it seems very promising.

http://www.gravelpave2.com/gravelpave2.html

The main problem has been in getting it installed correctly. It is messy and somewhat challenging for contractors to install as well, so might have some hidden costs (this is the mixed kind). Some of the companies require inspection during installation to warranty the product, which can be difficult if there are no certified inspectors in your area. I have seen it resist erosion on 12% slopes (at a large residential estate) with decomposed granite fines EXCEPT at the edges which can be messy/crumbly like asphalt if its not contained properly, and in this case it wasn’t.
That said, I love it as a surface. It has a satisfying crunch and nice atmosphere.

I’ve seen it used with mixed success. Where you have very flat slopes and little surface runoff, it seems to be fine. If you get any concentrated flow on it, even at 3-5% slopes it can erode badly. (I’m talking about generic stabilized DG, like 1/4″- with Road Oyl or Stabilizer or any of those products used as a binder.)

If it’s poorly mixed or not installed properly, It can crack badly, then you get erosion in the crack. The other potential issue is that if you use a stabilizer, it makes the surface like concrete with a scuffable chip surface. This is OK, except for tracking into buildings on damp shoes. Same problem with any DG. However, if some stabilized DG starts eroding, it’s very difficult to repair, unlike unstabilized DG, where you can scarify it and roll some more material into the wound.