Cons:
Acrylic- Has to be washed after each use, will not absorb only repel, not a breathable fabric, will melt
Wool-Some wool needs special care, more expensive, an animal product
Pros:
Acrylic-Cheaper, easier to wash, not an animal product
Wool- breathable, natural, can be used many times without laundering, absorbs 30% of it's weight, fire resistant