I am trying to perform CASSCF calculations for a series of diradicals. As input orbitals I have used two types of natural orbitals. One is unrestricted natural orbitals and the other MP2-based natural orbitals. From both sets I am getting different trend for the properties I am trying to look into. Can anyone suggest me which is the better way to know which results are reliable ? I have used ORCA 4.0 version.