The last time I really dove into this was a couple years ago. At that point Cuda had more features which allowed for more complex data structures, leading to sm

The last time I really dove into this was a couple years ago. At that point Cuda had more features which allowed for more complex data structures, leading to smarter algorithms, and an all around less painful time programming. Opencl has come along nicely in the meantime but I suspect Cuda has maintained it's lead and now has momentum with many developers.