Question: Difference in performace between 256gb vs 512gb

A friend of mine today made funny of me by asking this question:
Besides the storage capacity difference,
what are the difference (if there are any), between a MacBook Pro Retina 15" with 256gb vs 512gb.
Same processor, same ram, same evereything.  Exactly two identical machine, but one with 256gb and the other with 512gb.
Again, I know the storage difference, but there are any improvement in performace, speed and responsiveness?
Thank you
And tomorrow I can give him the answer :-)

No performance difference, only storage capacity.
Ciao.

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