You are unlikely to be able to tell ANY difference between any RAM running at 1333 vs. 1600 MHz. in REAL APPLICATIONS. FWIW some applications like higher frequency and some like tighter latencies, but the difference in performance is so minute you can only see the change via synthetic benches. In synthetic benches that show theoretical performance the 1600 MHz. RAM would likely show a slight benefit over the CAS 7 latency - but it depends on the benchmark used and what emphasis the benchmark places on speed vs. latency, so there is no exact answer to your question.
The exceutive summary is either higher frequency or lower latency will produce about the same performance in real applications. Tighter latencies especially with frequencies above ~1333 MHz. produce diminishing returns as one clock cyles becomes less in REAL TIME as the frequency increases. Since DDR3 RAM at ~1333 MHz. is not a system bottleneck on a typical AMD or Intel desktop PC, there is negligible potential for gains unless you are using a Llano APU where the GPU section can benefit from the higher frequency.
Thus it's best as always to Buy What Makes YOU Happy
as you and your PC are unlikely to be able to tell the difference in the minute change in RAM performance.
The link below may help you understand some of the issues?