For most, chin-ups are a staple in their upper body workouts, while some feel more comfortable sticking to the lat pull-down machine. But, for those competent in doing 10 solid reps (dead hang and no swinging), progressive overload must be applied to ensure continued progress in strength and size.
First, some lingo:
Chin-ups use a double underhand or supinated grip. Pull-ups use a double overhand or pronated grip. Neutral grip pull-ups involve performing a pull-up on two parallel bars with the palms facing each other.