ZFC vs NBG: A Comparison of Mathematical Axiom Systems

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Which one do you prefer? Which do you think is better?
 
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Neither one is better than the other, nor is one preferable to the other.
 
Er...ZFC, because it matches my curtains.
This doesn't really strike me as a "preference issue". You can prove the same things in both, so, as a fan of mathematics, I really see no reason to pick a side, since it's unlikely that I'll ever encounter a level of argument "low" enough that the difference is relevant.
 

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