I really like the second one (Dark themed one).

First off, im really into dark themed things, then there are the gray scratches.

For me, they are a really neat add.

So if you enter, go for it

Personally I love the one on the left, they both look great, but I must go with the left. 

The background has a really nice pattern, I can also see a background scene behind that, which gives it more depth, the added colour on it also adds to it!

That is my opinion, good luck in the contest!

The layering logo is great and I love the modern typography, but the composition works much better with the design on the left as of this point. Not only is the background well-done, but the logo pops out much better. The design on the right blends in too much, losing the effectiveness of both the logo and watermark/signature (the handle on the lower-right-hand corner).

That said, I wish you luck with the contest!

I feel like the name should be incorporated into the design, if you could do a mask on the logo on the right, and make it have a gradient overlay that slowly brings it to the front, that would be pretty cool.

Either way, the one on the right looks the best to me for a clean cut style.

Personally, I prefer the one on the right. That being said, that scratch mark behind the logo is a bit distracting and also kind of interrupts the flow of the rest of the background.

Could also try giving it a splash of color somehow.