Go for the cream. Wet the brush, knock some water out, put in a toothpaste-sized amount down in the hair, give it a squish and go to town. Keep adding water till that brush is just slipping around your face and you will be in for a great shave.
Brush size is a personal preference detail. I have both, Simpson Trafalgar T1 and more than one brush with a G5A knot. For me there is no comparison...the G5A wins hands down. However, I may be alone in that opinion. Best of luck with whatever brush you choose.