Both colors are fine to me. The golden one feels warmer yet the silver one seems to reflect a younger personality. She still left me the impression as a comforting and reliable rescuer when she tried to protect her sister(sand? Sorry, my memory escapes me). Silver fits into the whole new52 tune, heroes being young and more badass and impulsive. Maybe she can change back to golden costume after a big incident and when she's more mature.
It's not that one is older or younger, it's that one is warm and the other is cold. That's the same as with the DCU before and after Flashpoint. It's the eclipse that hid the sun.