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Differences What are the advantages of each

Front view of Radeon R7 260

Reasons to consider the
AMD Radeon R7 260

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More memory 2,048 MB vs 1,024 MB 2x more memory
Higher effective memory clock speed 6,000 MHz vs 4,200 MHz Around 45% higher effective memory clock speed
Higher clock speed 1,000 MHz vs 950 MHz More than 5% higher clock speed
Significantly higher memory clock speed 1,500 MHz vs 1,050 MHz Around 45% higher memory clock speed
More shading units 768 vs 384 Twice as many shading units
Lower TDP 95W vs 170W Around 45% lower TDP
Front view of GeForce GTX 560 Ti

Reasons to consider the
MSI GeForce GTX 560 Ti

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More render output processors 32 vs 16 Twice as many render output processors
Higher memory bandwidth 134.4 GB/s vs 96 GB/s More than 40% higher memory bandwidth
Wider memory bus 256 bit vs 128 bit 2x wider memory bus

Features Key features of the Radeon R7 260  vs GeForce GTX 560 Ti 

memory bandwidth Rate at which data can be read from or stored in onboard memory

Radeon R7 260
96 GB/s
GeForce GTX 560 Ti
134.4 GB/s
At 1366 x 768 the difference seems less memory bandwidth related and has more to do with efficiency of the graphics hardware itself.
Radeon R7 260 | by Anand-Lal-Shimpi (Jun, 2013)

pixel rate Number of pixels a graphics card can render to the screen every second

Radeon R7 260
16 GPixel/s
GeForce GTX 560 Ti
15.2 GPixel/s
Dual graphics with the Radeon R7 series will help leverage the GPU performance of these processors bringing great performance to cheaper PC setups.
Radeon R7 260 | by hassan-mujtaba (Dec, 2013)

texture rate Speed at which a graphics card can perform texture mapping

Radeon R7 260
48 GTexel/s
GeForce GTX 560 Ti
60.8 GTexel/s
We'll turn to 3DMark Vantage first to stress ROP and texel rates.
Radeon R7 260 | by Anand-Lal-Shimpi (Jun, 2013)

floating point performance How fast the gpu can crunch numbers

Radeon R7 260
1,536 GFLOPS
GeForce GTX 560 Ti
1,459 GFLOPS
The A10-7850K has a max compute of 856 GFLops (GPU + CPU) compared to 779 GFlops on the Richland A10-6800K APU.
Radeon R7 260 | by hassan-mujtaba (Nov, 2013)

shading units Subcomponents of the gpu, these run in parallel to enable fast pixel shading

The GCN graphics die would feature 8 GPU cores which represent a total of 512 stream processors.
Radeon R7 260 | by hassan-mujtaba (Nov, 2013)

texture mapping units Built into each gpu, these resize and rotate bitmaps for texturing scenes

The Radeon R9 280X is based on the 28nm Tahiti die featuring 2048 Stream processors, 128 Texture mapping units and 32 Raster Operators.
Radeon R7 260 | by hassan-mujtaba (Oct, 2013)

Specifications Full list of technical specs

gpu

Radeon R7 260  vs
GeForce GTX 560 Ti 
GPU brand AMD Nvidia
GPU name Bonaire GF114
Market Desktop Desktop
Clock speed 1,000 MHz 950 MHz
Is dual GPU No No
Reference card None Nvidia GeForce GTX 560 Ti 823 MHz 1 GB

raw performance

Shading units 768 384
Texture mapping units 48 64
Render output processors 16 32
Pixel rate 16 GPixel/s 15.2 GPixel/s
Texture rate 48 GTexel/s 60.8 GTexel/s
Floating-point performance 1,536 GFLOPS 1,459 GFLOPS

memory

Radeon R7 260  vs
GeForce GTX 560 Ti 
Memory clock speed 1,500 MHz 1,050 MHz
Effective memory clock speed 6,000 MHz 4,200 MHz
Memory bus 128 bit 256 bit
Memory 2,048 MB 1,024 MB
Memory type GDDR5 GDDR5
Memory bandwidth 96 GB/s 134.4 GB/s

noise and power

TDP 95W 170W

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