I was in a Sherwin Williams paint store today and one employee was
telling how the water based enamel outlasts the oil based enamel for
the interior of homes? Since I never used this type paint, does
anyone know if it is better than oil based ?

She did tell me it costs about $10 more per gallon than the oil based.
And in my opinion probably only worth using on new wood, not wood
already painted with oil based paint because of the prep work.