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Use both, and don't restrict yourself to one.
Thinner wool tends to not be as durable, but thick wool can last a lifetime.
Polartec fleece (the original) tends to be well made, but is susceptible to burns, collecting hair, smelling, etcetera.
I try to avoid synthetics on my skin, alas I find nylon underwear and fleece leggings works best because it is lighter weight for movement.
Wool works better in a wider range of temperatures for me, whereas with fleece I have to change what I am wearing more often. I find on trips, my body gets funk faster with fleece, such as more oils, body odor, acne.
Wool is more often heavier, and thus fleece works better as a performance fabric, or a mission specific. So i'd rather live in wool and work in fleece.
This is mostly looking at insulation layers though. Wool can double up as an insulation/outer layer in some conditions. Sometimes I will use two insulation layers with a base layer, 100 weight microfleece, and a woven wool shirt from like asbell wool. This prevents the fleece from vacuumin every piece of hair on earth, and sparks from torching it.
I used to always buy polar fleece, but more recently have found the 100 weight stuff works really well for a larger quantity of conditions. Swazi is one of the only companies still using polartec too, and they tend to have massive front zips to dump heat. Marines used to have a surplus polar fleece with pit zips too that was a godsend.
More recently the military has switched to grid fleece, which breathes a little easier than traditional fleece. You can find surplus from that on sportsmans guide sometimes. I don't know why people like melanzana, that colorado brand because their designs don't allow for the fleece to have any breathing room.
Stanfields makes great value insulation wool if you want it knit. There's also a billion people that make woven in Boreal Mountain, Swanndri, Asbell, Lester River/Empire wool canvas, parsons wool. Most of these work as a wool midlayer/outer.
