The "proven track record" part of your question is shortsighted. We shouldn't restrict future political thought by past political thoughts. We'd never see any progress that way.

If you're asking which one of the three I think we should focus our attention for change, I think the obvious answer from both a moral and logical standpoint is capitalism. The combination of democracy and free speech means money is political power. Allowing individuals to amass this much political power is both unjust and destabilizing. That goes for companies as well. If companies are going to be amorally motivated purely by money, we need to do a better job of pricing in externalities to put reins on that amorality.