The equivalent AMD would be the HD7950.
Probably Nvidia would be better, as the Adobe Suite applications can take advantage of the cards CUDA cores to assist in rendering. Though on the other hand if the application can take advantage of GPGPU and OpenCL/GL, then the Radeon would be the better choice.
So you'l have to balance which technology will have a bigger impact on what your doing.
The two are fairly close in terms of gaming performance, with a slight edge to the 7950.