What about WKeccak vs Cryptonote gpu "friendliness"? Which pow is expected to perform better on GPU once the optimized gpu code is released?
Current thought is it can be 2-7 times more efficient but not quite that cost efficient. The idea is as the coin matures the scratchpad size will increase. Currently the scratchpad can be creatively divided among texture memory on GFX cards. But in time that will no longer be easy to do. Rumors of a hard fork to cure this seem to be dying down because of this.
Currently the developer of the Wild Keccak GPU miner is keeping it to himself. Looks like it will only really benefit him.