Girls, what filler for winter jumpsuit do you prefer? The temperature …

Girls, what filler for winter jumpsuit do you prefer? The temperature in winter is about -15 -20. I have a choice between hollow fiber and Alpolux 250, do you think which will be warmer? And how to choose the right size so that until March it's okay? We're through next week 6 months old, height 70 cm. (born 52 cm)