Ontimpr2. Is the best improvisation inferior to the best composition?

Several theorists have argued that at the very least, if not practically always, improvisation is an inferior form of musical production than non-improvised compositions. It is easy to see why someone might believe this. Composers have a relatively unlimited amount of time to produce and edit and re-edit their work. Improvisers cannot re-edit and must spontaneously compose in real time. Hence, it is much more likely that the musical result of improvisation cannot keep up with the deliberate and thoughtfully non-improvised musical composition? Is this true or not?