I haven't tried the fleece, but I don't think you can get much warmer than Wooltimate. I also think getting burrs out of fleece would be harder. They do stick to wooltimate, but are fairly easy to remove. I have both the jacket and the pants and they get a workout here every year. When the burrs are bad, I put a pair of unlined bucksuede pants over my wooltimate and an unlined saddle cloth jacket over the jacket...no burrs!
Sorry I can only answer half of your question. I looked at both and thought the Wooltimate looked better. I don't regret my decision.
Russ