x2 Always look for quality! There's no sense breeding a browned out Pastel just because she's bigger.
Though personally, I would just buy a well started Super Pastel hatchling and raise it up. Breeding sooner sounds nice but think of it like this, would you rather have a 25% chance of hitting a Bumblebee between a SpiderxPastel pairing next year or be able to produce a clutch of 50% Pastels/50% Bumblebees in the next two years? It's a better guarantee to get what you want without worry about the odds gods screwing you over. o: