What will be the pros and cons of using each of these materials?One thing to keep in mind is that aluminum alloys are good conductors of electricity.
get fiber glass,they will last a long time
One thing that you didn't mention is the size of the ladder. Depending on the size wood ladders are very heavy compared to aluminum and fiberglass. I prefer fiberglass ladders myself because they are sturdy, don't conduct electricity and the weight isn't too much if you have a large ladder.
Aluminum is strong and lighter, but not electrically safe. Fiberglass is safe for electrical work and strong, but susceptible to sun damage, and can give out due to cracking. Wood will wear out, and is also damaged by weather, but is safe with electricity.
