I would definitely prefer the Intel just because you should get a lot more power out of it (CPU power anyway). Not to mention you'll never run out of RAM. The Intel option is pretty much as extreme as you can get; it will render amazingly fast and games will run like butter.
Also, the reason I threw 1866mhz RAM in there instead of something higher is because the lower latencies will increase render speeds.
You're joking right? You're not going to see a significant performance difference between 1866 and 2133. You will see an increase in render speeds with lower latencies though.
You won't see an increase currently, but the OP plans on using this computer for longer than 2 years, they will. When DDR4 comes out, the speed will be insanely high (3000+mHz), and the latencies as well. The Ripjaws Z has a reasonable latency with a very high frequency, which allows this computer to stay competitive with DDR4. Considering that software will begin to use higher frequencies, having faster RAM now will keep the computer running for longer.
DDR4 isn't going to be out until Intel's next generation, which is going to be the next line of processors after Ivy Bridge-E. The increased speeds won't make a huge difference anyway. The only way you're going to be able to tell the difference is if you're running benchmarks.
This computer is going to be mostly used for rendering and other similar applications, which means it's going to benefit more from lower latencies.
I resent - instead of that 2133 memory, he should use the 1600 Samsung memory and overclock it as needed. Any other 1866 memory will be useful as well.