The best method is always to hardwire something as in this case with a longer ethernet cable. This will give the fastest speeds yielding the best experience. This wil also be the cheapest route in terms of a solution as well.
A slinglink or wireless gaming adapter/bridge are meant for areas that are inaccessible and not capable of being wired easily or not at all. These methods do work under certin circumstances; but again not as well, fast, or reliable as a hardwired line.