The second kit (the "Beast" model) has slightly faster timings. 9-9-9 vs 10-10-10 but other than that they are the same. The differences in timings should not be noticeable at all. Either one you wanted to go with would be fine.
The Beast RAM is normally 1 1/2 times the price of the other, because of it's lower timings and ability to be overclocked easier. Since you can get the two close to the same price, if you are considering OC'ing the RAM, I would go with the Beast. If you are not overclocking, go for the cheaper.