is ball diff that important?

so basically both is great for race/drift?

I just want to justify if it's worth the extra $50 for the cyclone S rtr and it's all polymer composite ( plastic) compared to the sprint 2.

more feedback will be great cause i just place my order with tower hobbies will be great if someone can correct or affirm my choice or i can cancel it and place another order for the cyclone S if it is a huge difference in chassis capability