Hmm... another hard one to pick.
Entry 1 seems a bit much. It seems a bit too busy, an overload of pictures so to speak. Due to this it lacks a focal point, a place to draw the public's eye. Another draw back is the placement of the text seems a bit lazy, perhaps if they positioned the text vertically at a 70 to 80 degree angle along the Gundam's gun it would look better? Don't be afraid to try something new. On the plus side I think the metallic background looks good, shame there isn't enough of it in the sig.
Entry 2 isn't that bad of a sig, conversely there are a few minor mistakes which may cost the participant the Round. The picture has been rendered horrendously, it's quite choppy. In sig battles this can cost you dearly. However, I prefer the overall theme of Entry 2 over 1. There is significantly less going on, it has a nice focal point and draws the eye. In regards to focal points to Entry 1 it's almost a little confusing on what is the 'main' center of attraction to their sig.
My vote goes to Entry 2.
In Brisbane, Australia and wanna battle? Send me a PM and we can sort it out.