First of all, mills only use Hard Maple when running flooring, secondly, Maple is one of if not the hardest domestic wood species on the market and will resist denting and wear better than Oak.
Also, a prefinished floor is not a better way to go, most pre finished planks have beveled edges which will trap dirt and will let moisture through to the underlayment. A site finished floor with 3 to 4 coats of Oil Based Poly will give you a 100 year floor and with care will need to be refinished maybe once.
As for the choice between Oak and Maple, it is a personal preference, if you like a light wood with little grain pattern, then Maple, (there are lower grades with more charachter) if you like to see the grain and want to stain, then Oak. Maple does not stain well at all, so keep that in mind.