There is a big difference in the parties. Do you not have any sense of history or haven't you researched it for yourself? Why is it you think the Republicans have tried to obstruct Obama's administration every step of the way..regarding budget issues?
If someone is being critical of both parties and says that both parties are ineffective and neither side is fiscally responsible and has any workable long-term financial solutions, I would agree. But for someone to say that both parties are the same is either a misconception, misstatement or grossly inaccurate and they would have no clue about the political scene in current day USA.
Let's just say that hypothetically there was an iota of truth to that statement, it's certain that the Koch brothers believe there is a difference; hence, they donate their millions in campaign contributions in support of Republicans and Libertarian Party candidates.