I have made jackets of both the 200 and 300 weight Polartec. The fabrics are of the same quality just of different thicknesses. I no longer use either jacket; I much prefer quilted insulation layers either with down or synthetic insulation. I frequently use a lightweight (8 oz) Polartec 100 microfiber pullover for cold weather hiking when my merino wool base layer is not quite warm enough. The thing I don't like about either of the thicker fleeces is that they are heavy for their insulation value and they are bulky in your pack.
_________________________
May I walk in beauty.