I prefer the trophy rocks myself. I have tried numerous mineral supplements, and the rock seems to keep deer coming back, and last longer than the crushed minerals I have tried. Although it does leach into the soil, and deer will 'eat' a hole into the ground, I can visually see when it needs to be replenished. Both the white and brown salt blocks serve this same function, but I have seen that deer in my area prefer the trophy rock over the other blocks. Every locale is different though. My advice is to try a few different products, side by side throughout the course of a year, and see which your deer prefer. Then use 90% of that product, and 10% of the next best to ensure that your deer have an abundance of minerals available, year round.