As we said before Crucial is represented well in this test: they sent us no less than five sets. Three kits are part of the Ballistix Elite series, which comes with fully black designs this generation, including the PCB. The aluminum heat spreaders barely stick out above the PCB, which means they will fit in almost all configurations. The other two sets are from the Ballistix Tactical series, which features a more shiny and grey heat spreader. Technically the differences are negligible: they use exactly the same memory chips and both support XMP 2.0.
Out of the five kits three have a capacity of 8 GB, the other two are 16 GB kits. Since all kits consist of two modules, the individual sticks have a capacity of 4 or 8 GB. The 4GB modules are single-rank and single-sided, while the 8GB modules are dual-rank and dual-sided. In theory the latter should perform better. Four of the sets come with a clock speed of 3,000 MHz with CL15, while the fifth is a 3,200MHz-kit wtih CL16. As you can tell, there aren't many differences in terms of specifications.