both have their own merits for different usage in different situations.
the 7950 will have the vram and memory speed advantage as well as upper limit overclocking potential
the 760 will have the general out of box potential and well adaptability with battlefield performmance
SC2, BF3, Planetside 2 and WoT will probably be in favor of the 760. Crysis 3 will probably go in favor of the 7950(assuming you are using SMAA and not the inferior FXAA)
BF4 will be a mixed bag. early presumptions have the older 660ti and the 670 slightly better than the 7950, but thats early testing, and on the flipside, BF4 is known to be vram heavy at situations as well. Its best to wait out and see how the polished up game is after its release