I like both.
That said, I think the flat look of the original will serve better for marketing. Flat is in, especially in the tech industry. Just look at the latest OS offerings from Apple and Microsoft. Because of this, the one dimensional look of the 'older' logo may help to confirm the credibility of the ProtoShares brand. The flat logo looks modern, it looks new, and above all, it looks similar to icons of tech products we like and are familiar with. I understand that Invictus/ProtoShares isn't meant to be just-another-tech-giant by design, however it is important to remember that ideas being presented are very new, and therefore unfamiliar to most. It takes a bit of time to wrap your head around it all! It may prove useful to ease newcomers into the world of DACs with a readily identifiable logo that evokes the feel of other technologies people know and love. I think the original flat logo achieves this goal. No need to change it.