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That's a really open ended question. It all really depends on what's available to you. Generally at lower levels, staves are going to be more readily available. Staves generally provide higher bonuses to stats.
At higher levels (read endgame) it has been found that a mace and an off-hand provide higher spell damage or healing bonuses while less stat bonuses.
Couldn't have said it better myself.
I used a staff all the way to 70, when I found the Essence Focuser in the AH for peanuts. It didn't have the +int that my staff had, but +227 healing is hard to pass up for a holy priest. Then I picked up something for my off-hand with +int and balanced it out.
My only suggestion when you're trying to decide which to go for is to take the one with more healing/damage.... it makes you more efficient with the mana you DO have.
Good luck!