http://rog.asus.com/312772014/labels/guides/tried-and-tested-why-intel-ethernet-is-still-better-for-gaming/
and
https://teksyndicate.com/forum/inboxexe/intel-nic-vs-killer-e2205/156705
and
http://www.guru3d.com/articles-pages/msi-z87m-review-gaming,6.html
"Now the Killer E2200 gets traffic from the network, to the game, and back out to the network faster than any other PC network card. But I've always been a bit skeptical about the NIC as we say that lag is created outside your home network, e.g. in-between the router and the destination. The NIC can do very little about that, especially with the excellent Intel and Realtek NICs available these days..."
My understanding is that one of the main advantages is to reduce CPU processing so in systems with lower-end CPU's you could see a benefit there but I can't see that being an issue any more.
Some people say YES, some say NO but frankly I can't find any modern evidence that it serves a purpose any more.
*My advice is get a quality Asus board that fits your budget like the Maximus Hero VII.
http://www.asus.com/Motherboards/MAXIMUS_VII_HERO/