In short,

Phylogenetic analysis can use any character data to test hypotheses of relationships among organisms.

SSCP is a particular (largely obsolete) way of assaying genetic differences between organisms that can be used for phylogenetic analysis.

SSCP would be very hard to recommend, as it is technically challenging and provides less data than can be obtained through more easy modern sequencing methods.

Where available, good SSCP data is still valuable.

thank you