Cover 1 is brighter, but lacks cohesion, and the 6 doesn't stand out against the darkness of the logo. You've got four different tone sets (and their contrasts don't match), so it's actually harder to read the logo even though overall the whole is brighter: the interior of the logo -- the actual letters which you're supposed to read -- should have a higher contrast than the outline of the logo. As it is, the eye is drawn to the logo, but then glosses over it as a single dark lump. You've got three bands of divergent contrast going on.
Cover 2 is cohesive, the logo fits its background, the 6 stands out, and there aren't three different clashing color schemes. It holds together, and it's easy on the eyes. If you wanted to lighten it up, you could put more texture in the big black zone.
I voted for 2. IMHO cohesion and legibility trump shiny.
Cheers, -- N
PS: In terms of logo legibility, I'd recommend:
- Remove the ligatures from the "n". As they're used now, they muddle the space between the "i" and the "n" (instead, remove the ligatures between the "i" and the "n", and just tighten up the kerning between them). The ligature between the "n" and the "y" isn't bad, but it's not nearly as cool as the "esti" bundle. The "esti" bundle improves legibility, while the "ny" ligature just muddies the space between the letters.
- Drop the skull and make the "D" bigger. Right now it takes a bit of thinking to recognize that the "D" and the "6" are supposed to go together. It looks more like "Destiny / skull 6", which makes no sense. If the "D" is blatantly bigger than the "estiny", it's easier to parse that it's meant to be used for two different things. If you want to make it really easy for the reader, use some red in the "D", perhaps an outline, highlight, or drop shadow. Clue him in that he's supposed to associate the "D" with the "6".