Apple does not price match.
The main difference is you're beholden to the 3rd party return policy which may not be as good or convenient as dealing with Apple - ie. 14 day no questions asked easy, extended holiday return window, can bring to any Apple store. You can also take advantage of Apple's financing system/gift cards, deal with their trade in system, get cash back, and things like that.
Otherwise it's basically the same. Any warranty service is done through Apple.
I generally recommend people deal with Apple if they're not entirely sure about their purchase and may want to swap for another config as doing that is easy and painless. Or if they tend to have bad luck getting a perfect machine. Otherwise if you can save a bit beyond Apple's perks, go with a 3rd party.