Depends of a couple things, mainly- is this a growout frag tank or a frags for sale frag tank?

If its a growout frag tank, to grow corals big enough to add to your display, then the same type of lighting should be used on your frag tank and display tank, for acclimation purposes.

If the frag tank is for frags to sell, then I recommend the lighting that grows the corals you are keeping fastest. Shaded areas and different levels are very helpful in a small tank with high lighting, if you are having issues keeping certain corals happy due to lighting.