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Which Roth IRA is the best for a 21 year old who has about $1500?
Your question seems like you don't understand what a Roth IRA is. A Roth IRA isn't an investment, per se. It is just a type of account that receives special tax treatment.  Just like a checking and savings account are different at a bank, a ROTH IRA account is just flagged as such by a brokerage. It isn't an investment type, and there aren't really different ROTH IRA accounts.  You can invest in just about anything inside that account so that is what you need to evaluate. One Roth IRA account is as good as any other.As to what to invest your money in inside a ROTH, that is a huge question and off-topic per the rules against specific investing advice.