Compare borrowing costs
EMI shows monthly payments and an amortization schedule; Loan gives a compact total. Use the same amount and rate when comparing tenures, and compare interest as well as the monthly payment. Neither currently models a mid-loan prepayment.
Match the deposit pattern
FD models one cumulative deposit. RD models fixed monthly deposits. SIP supports annual step-up and beginning-of-month contributions; Compound Interest supports a starting balance and month-end additions. Their timing conventions differ.
Keep assumptions comparable
Use Inflation to express a future amount in purchasing-power terms. A quoted nominal rate, effective annual yield and market-return assumption are different inputs. Product rates, fees, taxes and risks need a separate check against the provider terms.