Hey Colton!
If you DON'T want to pull equity out, you should be okay with just a rate/term refi. If you did want to pull equity, conventional financing requires 12 months of seasoning (time that you've owned the property) to use the appraised value. Conventional financing will also require that you qualify using employment history, income and DTI. A lender will use 75% of rents, 25% is deducted to account for vacancy/expenses.
DSCR loans don't require all of those things - your FICO and the income from the property are the main determining factors. Not sure if you own or rent your primary home, but not all DSCR lenders will lend to first time homebuyers and/or first time investors...just a heads up. DSCRs will have slightly higher rates and they also carry prepayment penalties, which kick in if you sell OR refinance the property within x number of years; 3-5 years is common. The penalty can be reduced, but there's a fee (or you take a higher interest rate).
Not trying to make your head explode, but if you have questions I'm happy to chat! Feel free to reach out any time.