Which Lan NIC is better?

[SpaceLama]

Qualcomm® Atheros Killer E2201 LAN chip (10/100/1000 Mbit)

or

1 x Intel® GbE LAN phy (10/100/1000 Mbit) (LAN2)

also is "teaming" useful for gaming and what is it

I am looking at

 

[RealBeast]

IMO the Intel is the most stable and reliable. I've helped many users that have had issues with the Killer LAN adapters.

Forget about teaming, that requires all compatible specific equipment, which allows you to aggregate bandwidth from several adapters, as an example between large storage arrays and managed switches -- it is only useful in enterprise situations.

 

[Kewlx25]

I second Intel. Teaming is meant as a way to increase your bandwidth when a single network connection is not enough. Maybe you need 2Gb instead of 1Gb, but you don't want to pay for a 10Gb NIC.