the kingston ram is considerably faster, both have xmp. Both are decent brands.
Kingston is the obvious choice. Although i'm surprised you couldn't find a g.skill kit similarly priced at same 1600mhz speed.
CL7 (7-7-7-18-2N) @ 1066MHz for GSkill means lower latency, also use's 1.5v
CL9-9-9 are higher but 1600mhz speed is preferred. Please note the 1.65v is slightly outside Intel's recommendation for Haswell, Assuming that is what you have in your z87. I'm sure it's fine but could easily find some 1600mhz sticks @1.5v.