There actually isn't a difference of any significance in the two parties. You're a useful idiot and an enabler of the perpetuation of the failed status quo if you think there is.
They depend on you to buy into their divide and conquer scheme to stay in power.
Both parties support : perpetual war, more taxes, more spending, controlling more aspects of your life they have no business in, at gunpoint or with incarceration if necessary, corporate welfare, foreign aid and weapons sales, even to our enemies, the Fed Reserve, regulations that favor Wall St at the expense of mom and pop, the drug war, deportation, violating the 4th Amendment, and that's just a quick list off the top of my head.
Both parties are owned by big oil, big banks, big pharma, and as we see recently foreign interests.
The differences are subtle and over stupid social topics that are divisive but mostly already settled. They are also insignificant without a country or economy. They are to keep you distracted away from the real issues and give you the illusion of choice. ( it seems to be working) on you, and millions of others like you.
What is a substantive difference, sans genitalia, between Hillary Clinton and Dick Cheney?
The sheepish masses allow them to continue their ploy.
You're the audience cheering against the villain at the play, but the hero is just a puppet.