Is heresy more damaging to orthodoxy than apostasy?

It is useful for anyone interested in the maintenance of orthodoxy to bear in mind the difference between heresy and apostasy. The Code of Canon Law sets forth this distinction in Canon 751, which differentiates among heresy, apostasy, and schism:

Can. 751 Heresy is the obstinate denial or obstinate doubt after the reception of baptism of some truth which is to be believed by divine and Catholic faith; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Supreme Pontiff or of communion with the members of the Church subject to him.

The distinguishing factor here seems to be rejection of part of the faith ("some truth which is to be believed by divine and Catholic faith), as compared with rejection of the whole ("total repudiation of the Christian faith"). There are different ways in which heresy and apostasy may each be more damaging than the other in certain respects. But from the point of view of maintaining orthodoxy within a community, heresy seems more dangerous in that it might travel under the appearance of orthodoxy precisely because it differs from orthodoxy only in some truth rather than in repudiation of the faith itself.