Both of those compounds fell into the "C" category for Moderate performance on this incredibly comprehensive set of reviews. That means there are about 40 compounds that scored better, and the difference between Cooler Master and Antec 5 was one tenth of a degree.
You know what? I own 5 of the Cooler Master Hyper 212 plus heat sinks, and each one of them has the very same paste that came in the box. The reason for that is that there is 1.3 degrees difference between that "free" TIM and the Shin-Etsu Masscool stuff you can buy a single application for $7. For a single degree, it just isn't worth it.
Now for my Thermalright monster chiller on my i7-920, that I like to crank to the limit, every degree makes a difference. For benching, buy the best performance you can - a degree in this case might make the difference for a winning overclock. If you are looking for that kind of performance you are going to spend a lot more money on your heat sink