I not a serious nut conneiseur, since just buying a tub of almonds at costco once in a while is good enough for me. however, prices are going to fluctuate between the various nuts depending on harvests and stuff. For instance, a few years ago pecans were cheaper than walnuts, which lead to demand for pecans exploding in China, and now pecans are significantly more expensive.
Also, make sure you're talking evaluating pound of edible portions. For instance, from this like:
I just learned that pistachios are 47% shells by weight.