Hi Moo, your choice how you finish the fret board. I have used Dingo Wax on a couple of Rosewood fret boards and lemon oil on another and whilst a bit more effort was required I would have to say that wax is better. This is how most rosewood fret boards are finished however with maple store bought ones are coated in some form of lacquer. If that is the feel and look you are after use the same stuff on the back & front of your neck but be prepared to clean the finish off each of the 21 frets when your are done. Upside is low on-going maintenance, downside is more prep work to get it ready to play. On my J Bass I used Tru Oil with about 6 coats on the fret board as they go on quite thin.
Using wax or lemon/orange oil on maple fret boards will require reapplications periodically, wax maybe not so often but be prepared to re-oil every string change or maybe every 2nd or 3rd if things still look and feel ok. Leaving maple this way can bring on a bit more of a grimy appearance over time too.