5G: How does Access and Management Function i.e. AMF select Session Management Function i.e. SMF ?

Question

If I compare SMFs of the 5G network against the SGWs of LTE network then what would be criteria of SMF selection in AMF ?
In the LTE network, MME selects SGW for an UE based on the location of eNodeB so that it can minimize frequent change of SGW due to mobility.