I see this question asked all the time. The fact is that it's a matter of preference. Which morph do you like better and why? Some people like spiders, some like pastels, most people like both. Spiders have "the wobble" and pastels "brown out". Make the choice based upon your opinion of each morph.
Co-Doms and Doms are 50/50 when bred to a normal (50% morph/50% normal). This ratio is based per egg though (not 50/50 per clutch). So with the luck gods on your side you could technically hatch all morphs... or at the same time... all normals. But it's 50/50 per egg whether it be normal or morph.