I will recommend the AMD Radeon R7 260X over the 750, the real competition is with the 750 ti version.
I personally own a Sapphire R7 260X OC paired with a FX 6300 (uber bang for the buck 18 months ago) and game at 900p at High settings getting around 50-65 fps in modern games like: BF4, Shadow of Mordor, Ryse, H1Z1, etc.
The only scenario to recommend the gtx 750:
1) Low power supply without a pcie 6+2 cable.
2) You prefer the Nvidia brand.
3) Going to play MOBA games like LOL or Dota 2.