These are very different brushes. The Manchurian Chubby 3 has a BIG 30+mm knot; the Plisson 14 is small, at 22mm. Neither brush will be super-soft. If you're looking for a brush with very soft tips and a bit of backbone, you might want to consider the Thater 4125 series - they come in a variety of sizes.
These two brushes are so different from one another that I can hardly imagine them being in the same comparison. Are you looking for a huge brush or something medium-sized?