I'd choose the first. he second has excessive lighting that makes the render look low quality. There are several nits to pick in both versions, however. First things first, the borders look messy and not well incorporated into the rest of the signature. I know borders are, in many cases, supposed to stand out, but in this case they seem to be distracting. I can see that you're trying to give the impression of being 'digital' with the pattern you used on the borders, but a less-crowded pattern may suit them better.
Also, the text: I think it's much better than most of your other works you've previously shown me :) However, I'm wondering if it might be better to discard the tail part or whatever it is located beneath the text. Since the lower parts of the render aren't shown, it doesn't even look like that part is connected to the rest of the render, so it may be better to not have it at all as it looks kind of out of place. Besides, without it, I think the text would look clearer with fewer distractions as its colours already match well with the background.
All in all, a better job than before :)