TurboTax will automatically recommend the best route for you based on answers you provide. However, you may want to consider getting a copy of your last years' tax return. When requesting your copy, you can choose either a tax return transcript, which is free or an exact copy which costs $50 (the fee may be waived in Presidentially declared disaster areas).
Tax return transcripts include most line items from the originally-filed Form 1040, 1040A, or 1040-EZ return. They're available back to 2013 and take 5-10 days to arrive in your mailbox.
Order your transcript online or by mail from the https://www.irs.gov/newsroom/request-a-transcript-or-copy-of-a-prior-year-tax-return website or by calling their toll-free number 1-800-908-9946.