You should find an experienced Real Estate attorney to explain these options to you and recommend which works best for your particular situation. That being said, be careful with rent to own contracts, as they are full of pitfalls that can cost you money. An attorney should carefully review any such agreement you sign.
This answer is intended as informational only, and does not constitute legal advice or form an attorney-client relationship between us.
There is a significant different between rent to own and seller financed. You really ought to hire a real estate attorney to assist you with this transaction. The little you pay the attorney now could save you thousands down the road. Best wishes to you.
I agree with the other Attorneys. There can be big differences between the two. If you do not think you will qualify for a loan, seller financing may be the way to go, but definitely have the documents looked at by an experienced real estate attorney.