which is better?

Solution
I think the 3 titan X setup would be better because some games dont support SLI so you would want the stronger smaller amount of GPU's also with 12gb of VRAM for high resolutions.

that's a crazy SLI set up btw good luck :)
I think the 3 titan X setup would be better because some games dont support SLI so you would want the stronger smaller amount of GPU's also with 12gb of VRAM for high resolutions.

that's a crazy SLI set up btw good luck :)
 
Solution
Well SLI doesn't scale well with 4 cards so a 3 card Titan would probably be better and it will have plenty of Vram for super high resolutions with all the eye candy turned on. A 3 card super high clocked 980TI SLI would do the trick as well just would only have 6GB of VRAM but it may cost a bit less. One thing to remember is that Pascal is right around the corner. Also we still don't reallyknow how DX12 is going to run on current gen cards.