You can't debate it until you test your connections anyway. Excuse me for a moment as I am geographically challenged when it comes to the US, but if you live on the East Coast and for some reason your ISP decides you should be routed through a node thats central or, god forbid, the west coast, you're likely to experience a whole heap of issues. It's got nothing to do with how close you are to someone.. it's got everything to do with how your ISP decides to route your data at that point in time, wireless or not.
On the other hand, if you're both with the same ISP in the same general area of your country.. you'll have a perfect connection (unless your ISP is retarded and doesn't keep its traffic within its own network).
PS: This also assumes that the game handles its netcode properly.. if it has bad netcode, it has bad matches, obviously.