noahmorgans :
DDR4-3000 CAS 15 or DDR4-3200 CAS 16. Same amount of RAM.
In real world performance, they're about the same. Get the cheaper set. For reference, your performance plateaus will be at 2133mhz, 2666mhz, and 3000mhz. Anything in between 2133mhz and 2666mhz, between 2666mhz and 3000mhz, or above 3000mhz won't really show any real world performance difference compared to 2133mhz, 2666mhz, or 3000mhz themselves.