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Both phyletic gradualism and punctuated equilibrium are speciation theory and are valid models for understanding macroevolution. Both theories describe the rates of speciation. For Gradualism, changes in species is slow and gradual, occurring in small periodic changes in the gene pool, whereas for Punctuated Equilibrium, evolution occurs in spurts of relatively rapid change with long periods of non-change.
The gradualism model depicts evolution as a slow steady process in which organisms change and develop slowly over time. In contrast, the punctuated equilibrium model depicts evolution as long periods of no evolutionary change followed by rapid periods of change. Both are models for describing successive evolutionary changes due to the mechanisms of evolution in a time frame.