My money is on the little one.
45 Minute speed painting Done from memory, so I hope you'll forgive any forgotten details. You can see the sketch on my blog. It's really really rudimentary.
Two quick artistic things.
First, Nero's ship design is !@#$ed up. It's so overwhelming that I was like "ok, i'll just do something that reminds me of it..."
Second, I was so not surprised to findout that Ryan Church was the concept artist for Star Trek. The visual was very... Ryan Churchy. So I just did what he shows in those vids.
Though, I can never get the detail he gets using his method. It's great for starting stuff out though.