Foam vs Fiber insulation

My 1950's 2-story brick and wood home has little or no insulation in the walls. I'm debating between the injection of expandable foam and having fiber blown in. The advantage of the foam is that it seals very well, and can be injected where there is brick. My concerns are moisture due to lack of breathability and heat buildup around wiring.  AJW

My opinion....

Neither........ Of course, opinions are just that, everybody has one.