One thing I will not do is swirl a wet brush in a tub of cream, for two reasons: so the water will not turn my creams into a soupy mess and to avoid the possibility of mould. So for me it makes the most sense to use a snurdler and a bowl. Plus, as 10Pups pointed out, it seems to be the best way to make sure your mixture is perfect BEFORE applying the lather to your face.