Hmm, I think if you're going for a more robot-y cyber feel (or like something super advanced like traveling through time) then the one on the left is better.
But if you're going for a more explosion-y mystic feel, go for the one on the right.
Personally though, I think the one on the left looks better just because the background makes it feel more ominous and sort of relates to the plot.
Also, just a side note, I still can't get the oak background to work. I inserted it and repointed the two pointers but when I check it out in game it's a bunch of glitchy tiles and my real background only appears for a second or two. I'm soo confused. >__>