It's become popular for a while now to suggest reverse-grip triceps work. Makes no sense to me, as the limitations of the grip will always mitigate some of the benefit.
Better to me are various compound triceps exercises like dips, dip machine, bench dips or close-grips done with the usual grip but knuckles facing inwards towards each other. That not only works the medial and lateral heads more effectively, it can be done with decent weight. Wide grip rope pushdowns basically allow this to be done more easily because the grip's flexible, the wrists aren't forced to stay in the same position.