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Which Roth IRA is the best for a 21 year old who has about $1500?
You're young.  Build a side business in your spare time.  Invest in yourself.  Fail a few times when you have some time to recover financially. Use the money that you would have let sit in some account and develop your skills, start up an LLC, and build up the capacity to get some real returns on your money. Be a rainmaker, not a Roth taker.