Those are both maniac varieties and should be growing like weeds and bearing like crazy. It sounds as if you have a root problem on the one; were they bought as potted trees? If so it may be root-bound or the planter mix is rotting and starving the roots of oxygen. Gopher attack is also a suspect. Also, check the bark down by the soil line to see if any of it is dark and sunken, and if so, probe around to see if you find any sawdust underneath that's evidence of a borer. In either case, replacement may be your best option as they are plentiful bare-root in a month or so and will grow quickly.

Water and nutrition-wise, they like moderate watering and low-nitrogen.

Applenut