That is an exhaustive test of this difficult subject.
Note, the Titan is about 15% faster than the 780, both can be overclocked.
Also note that these tests were done with 3960 CPU and expensive motherboard. Both together cost, maybe, $1,300. You will probably be getting a 1150 type processor making the tri sli even less worthwhile since the PCI-E 3.0 bus will be 8X 4X 4X while for the test it was 16X 16X 8X with the expensive processor.
A Titan isn't worth the premium price you pay for , you are much better off getting a 780 and overclocking it and you will have the same if not better performance of a Titan for much less.
3 x 760 in SLI is a great set up , decent price for great performance. You will need the right PSU and Mobo for it to work best.
In my opinion a 770 is a great card for its price or even 2 X 760 in SLI.
SLI is easy to set up.
Which of these would have a better pice to performance ratio, and is it hard to set up sli?
Also which would be better in benchmarks and games?
The only reason to ever buy a titan is its exorbitant frame buffer, so if you are playing at 2560x1440p or higher it might be, emphasis on the might, otherwise I would say don't do either, with 3 way sli you are going to see pretty bad scaling in a lot of games. I recommend possibly 2x 4gb 770's or 2x 780's.