I'm running one kit of both in my desktop, and they both work equally well. In all honesty, take your pick of which heatspreader you prefer if two kits of the same specs are also at the same price - there will be zero noticeable difference between the two, even if they do have different specs. There's no reason to even look at their value/budget offerings when the price is only $1 or $2 less.
I have an interesting stance Corsair. With G.Skill, all of their memory is top quality - NewEgg's ratings will show you that. They just make good memory... nobody else even comes close to their number of five-star ratings. With Corsair, they make very good "extreme overclocking" memory... the problem is that this high-class memory seems to trickle down through the binning process; what you end up with at the bottom is what started as high-performance memory (raising the price), yet isn't quite stable/reliable enough to pass in their lineup. Now, I know a lot of Corsair fans are going to come yelling at me for that statement, but it's just my opinion... take it for what it's worth. All I know is that two pairs of Corsair ValueRAM have failed on me in HTPC/Budget builds, and not a single kit of G.Skill has even had a hiccup yet. It's just all-around good memory that deserves more attention than it gets.