Using Private Money (not hard money) is great if you have relationships with the right people. Do you already have the lender in mind?
Run your numbers, and if the deal supports it, it is certainly worth using Other People's Money instead of your own.
You can leverage and scale so much faster.
If you have 100k and were thinking of putting all 100k of your own money into 1 deal, you could become cash poor.
Additionally, you are only able to reap the rewards of one deal...and that is a lot of risk in one deal.
That same 100k, you can keep in the bank (if your private lender agrees to $0 down) and flip as many properties as the lender can afford to fund (and as many as you can manage).
Or, you could leverage it on 10 different properties at 10k down payment each (if that is what you and the lender agreed to).
You and your private lender can agree to any terms you want. No monthly payments. Any interest rate. Any down payment. You can be as creative or simple as can be agreed.
Over time, you may be able to secure private lenders for both short and long-term loans. Cash, Self Directed IRAs, etc.