Will benchmarks show an improvement? Yes. Will your human brain ever notice that difference in gaming applications? Nope!
Low latency numbers on DDR3 RAM, when it comes to gaming, are good for flexing benchmark numbers at your next LAN party. Anything at or below cas9, you're not going to notice the rapidly reducing gains.
Go with the cheap G.Skill unless the looks of a heat spreader are important to you. The heat abatement provided by a heat spreader on non-overclocked ram is negligible, providing you have anything resembling proper air flow.