Note that darker chocolate is more dangerous than milk chocolate. (aspca.org)
It's best to stick with dark chocolate chips for the antioxidants they contain, and the milk and sugar they have far less of than milk chocolate chips. (paleogrubs.com)
In general: Often referred to as the «healthy» chocolate, 70 % cocoa chocolate contains considerably more cocoa and less sugar than its milk chocolate relative. (womenshealthandfitness.com.au)