[Al Skierkiewicz]

No one has yet mentioned the length of time or expense to obtain one vs. the other either.
As an aside, I have a friend who worked for a rather large tool maker for a number of years. He quit when the company had him in court defending tools that had been first patented in the 1800s and were still being used by idiots who hurt themselves. One of the cases that was the straw that broke the camel's back involved pole climber spikes. A user (power company employee) got fed up one day after something like 12 years on the job, and decided to step off the pole 12 feet above the ground. He testified that he knowingly unhooked his safety harness and jumped off the pole, Not fell mind you, jumped. When he landed, the pole spikes jammed into the asphalt and broke both legs in several places. He was suing the manufacturer for something like $1.5M because the spikes didn't have a warning label against stepping off the pole at 12 feet above the ground.