In my experience, fleece is more durable andlong lasting. Moths have not yet learned to consume fleece, but they do nibble away at my wool garments. My subjective opinion is that fleece dries more quickly when wet, and hence is somewhat warmer, but wool does quite well in this regard.

I have two fleece sweaters that are more than thirty years old. One, aged 38, is definitely worn, while the other remains in top shape (It did spend a season on Denali, but isn't used extensively in southern California). My wool items have lasted only about fifteen years or so.

Either fabric is a good cold weather choice and both are available in different weights. Quality of design and manufacture is more significant than the choice of either fabric. Some items are garbage and some are excellent

Good grief! This thread is ten years old...