ZFC and NBG are both mathematical axiom systems that can prove the same theorems, making the choice between them largely subjective. The discussion emphasizes that neither system is inherently better or preferable, as their utility depends on context rather than personal preference. Some participants humorously mention personal biases, like aesthetic preferences, but these do not impact the mathematical validity of either system. Ultimately, the consensus is that the differences between ZFC and NBG are not significant enough to warrant a strong preference. The focus remains on their equivalence in mathematical proofs rather than individual opinions.