16GB 1600mhz vs 16GB 1866mhz RAM for Macbook Pro 13" mid 2012
2012 MacBook Pro 13" specification states that it supports 1600 MHz RAM. So, Kingston modules do not have an advantage, as the memory will run at 1600 MHz.

Purely, from numbers point of view, your geekbench results point to Crucial being faster. However, I suspect it is due to variance. You can try to rerun the same test several times and see how the scores differ from run to run.

Both Kingston and Crucial are well known brands with low failure rates. And unless you are going to put your computer under heavy load, memory intensive constant tasks, you will not notice any difference between the two in terms of speed. So, if I were you, I would buy whichever is cheaper.