1. The crispy walnut is edible and beneficial to people's health. The hard walnut has a thick cortex and the nucleolus is not very good, which is the difference between them.

2. Actually, as far as these two walnuts are concerned, I may prefer crispy walnuts, because the kernels of crispy walnuts are more crisp, and then they don't have the oily feeling. I like the feeling that they are not particularly oily. If they are hard walnuts, their shells will be harder, and then their taste will be oily. I don't particularly like that, so I like to eat crispy walnuts.