Let's just do the math, the frequency is expressed in Hertz, which means "cycles per second". So, the DDR3 2133 will perform 2133 cycles a second while the DDR3 1600 will do, well, 1600. You, of course, know this.
Now the CAS latency is given in cycles. So, a CAS8 DIMM will take 8 cycles to respond and the CAS11, 11 cycles.
Now putting it all together - the DDR3 2133 CAS11 will take 11/2133 seconds, which is equal to 0.00516 seconds, to respond while the DDR3 1600 CAS 8 will take 8/1600, which is equal to 0,005 seconds, to respond. Thus, the 1600 DIMM is faster. For your dilemma, you're contemplating 0.000516 versus 0.00422 or timing difference of 0.00094 seconds! How fast are your reflexes and how long are you willing to wait for your memory to respond? Yes, I'm being an ass. You'll never ever see, feel or sense a difference.
You'll also want to carefully check the timings, since the higher the MHz the looser they are. I've seen 2133 DIMMS with 11-14-28-30, simply junk. As well as voltage, avoid anything higher than 1.5V. The only way many manufacturers get a respectable CAS at high MHz is to crank the voltage to 1.65V. Hence is why the 1.35V Samsung DIMMS are so smashing. Also, less DIMMs generally means less load to the memory controller. Therefore, 2x8GB is better than 4x4GB.
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