Here is an unpublished excerpt from Professor X:
"Since Sharpe ratio uses standard deviation as a measure of risk, it assumes normal distribution of the underlying returns and it would therefore not be appropriate to use as a performance measure for hedge funds.
Information ratio avoids some, but not all, of the issues with skewness, as it uses mean return. Even if the skewness problem is avoided, choosing the appropriate benchmark for a hedge fund to be able to apply the information ratio calculation is not easy. There is very few of hedge fund style-specific benchmarks available, although some general hedge fund indices do exist."
Now I fail to see how this point adds up given that the two measures look identical apart from using the Risk free rate instead of Benchmark return in the former