The deal always dictate the type of financing you would use not the other way around.
Here's an example -- I did a deal where the property was in good condition (just needed paint, carpet, cleaning and some landscaping). The owner was moving to Texas from NJ. His main concern was not being an out of state land lord; but he can't afford 2 house payments, one in TX and his NJ house. He was not behind on the mortgage and has $100k in equity (appraised at $275k, mortgage balance at $175K; monthly payments was about $1k). The house was originally listed with a Realtor for $275k and was lowered to $230k by the time he called me.
I asked him how much he wants over and above his mortgage and he said $25k, which means I can buy the house for $200k. I asked if he needs the entire $25k to move to TX and he said no; only needs $5k now.
I simply took control of the property, we signed an agreement that I will pay his monthly mortgage payments (PITI) and any maintenance on the property. I locked in the purchase price of $200k with the right to lease; $5k down payment, balance of $20k payable in 2 years. This is almost a Subject-to deal but I did not transfer the deed so as not to break the due-on-sale clause on the mortgage agreement. Spent another $5k for paint, carpet, cleaning and landscaping. I had a renter lined up for $1,800/month which would give me a net income of $800 monthly. However, a buyer showed up and made an offer of $265k and I accepted the offer. Took about 45 days from taking control of the property to selling it.
When you market for properties people will come to you with all sorts of real estate problems. Your JOB is to solve their problems, not take it over or create new problems for yourself; which is why I say, the deal determines the financing. The deal above did not necessitate getting a new loan, hard money or otherwise.
Learn to solve people's real estate problems and you would be able to do deals others wouldn't know how to put together because they lead with financing in mind. By the way the seller above spoke to 4 other real estate investors before me and no one offered the solution I presented to him.