Requiring and verifying a positive credit history is the best way to select a reliable tenant.
S. Walton Simpson
Keller Williams Realty
That depends on so many factors. The big question - do you want to be a landlord? Do you want to get the call when the furnace goes and needs to be replaced? Do you have the funds to be able to be a landlord and deal with that type of thing? Also remember that you will most likely use a property manager since you will be out of state.
Good luck and have fun with your grandchildren whatever you decide!