When it comes to major purchases, consider paying by debit or credit card for the simple reason that both forms of payment offer you better protection than cash.
One of the biggest protections that debit and credit cards give consumers is the ability to do a chargeback for improper charges or fraudulent purchases. A chargeback effectively reverses a transaction from your statement or bank account. For obvious reasons, the same protections are not given to purchases by money order or cash.