One of the main reasons people put residential, 1-4 unit, investment property in their personal name is so they have access to cheap fannie/freddie mortgages. Secondarily is the upfront and ongoing cost of LLCs in some states (CA is the big one).
If this is a business deal with property included, then you are getting a commercial/portfolio mortgage, seller financing or SB loan, correct? Of so, then I would definitely go for the LLC.