Eyefinity vs nvidia surround

My next upgrades will be a new gen multi gpu setup and I am going to run another monitor. 5760x1080.

My question today is what gpu manufacturer offers the best experience overall for gaming?

I remember back then that AMD was the best choice for multi monitor setups. Did that change?

If any of you have had both experiences, I would like to hear from you :]

Thanks!

 

Thanks :] Yea I may want to buy some 970's, but I also want to see what the 390x 380x has to offer. Hard choices.