I like the first one better as well, I didn't really make that clear. But I like the science idea in the second video. A subtle indication of the idea behind the coin is a very nice idea. The first video looks more mechanical. I also like thing floating/turning around the symbol. There are lot's of science things that 'circle' around. Electrons around the nucleus, planets, time-space, circular processes, BOINC project symbols/reference floating/gravitating around, crunching number, ...