Personally, I like polar fleece. It's very comfortable. It makes almost no noise at all when moving through thick scrub. It only holds a very small percentage of the weight of the garment in water when wet and then wrung out. It's very lightweight compared to wool and best of all, it doesn't scratch your skin, or end up stinking like an old sheep after a bit of rain.
Wool garments are supposed to keep you warm even when they're wet, which is a good advantage, if it's true. Wool is also very safe around open fires, as it doesn't burst into flames like many synthetic materials.
Some polar fleece clothing offers a feature called DWR (durably water resistant), namely 'Ridgeline' of New Zealand. I have a few items made of this material and it certainly works very well. They will get wet, but it never soaks through to your skin. I've owned mine for many years and they're still very water resistant. I always pack a top quality Goretex raincoat as well, just in case.
I've noticed that wool rates very highly on US forum sites, as the best material, but I'm still not convinced that it's any better than good quality polar fleece. What do you reckon?
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Mick