BiggerPockets

zip code
number of units (sfh/mfh)
bedrooms and baths
years that newest mortgage has been in place
out-of-state owner
tax assessed value (if there is some multiplier that gets this to be in the ballpark of actual value; worthless if actual value is all over for a specific assessed value)
your exit strategy

Those are some categories for sorting this data; what ones actually would lead to best profit could be very dependent on local factors as well. Your exit strategy is a factor. Because a house with high value may never cash flow as a rental - so, assuming a landlord's buy-and-hold exit strategy is what you are using, you would avoid that type of house.

As Steve mentioned, your strategy is important in order to properly answer the question.

Steve and Justtin laid out some great criteria to use.
I will add that if you are looking for opportunities for owner financed properties, use a search criteria with 25% or less LTV on the property. This will ensure enough equity for a potential owner carried note, getting you in with little to no money.