Need quick advice on mbp!

i received refurbished mbp model ups today. g0m1dll paid 1650.
open box 1 md035ll/a 1560.
differences 2.2 6mb vs 2.3 8mb , 500gb 7200rpm vs 750gb 5400rpm.
should keep or should return , second one?

 

would computational needs profit 100 mhz increase , bigger, slower hdd?

 

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