The best triceps workout for size and outer triceps is more about how your WHOLE training program is organized than specific triceps exercises or a single specialized routine.
Let me explain…
There are three heads of the triceps that you need to workout in order to get the most size out of them. The medial, lateral and long head of the triceps. But the exercises you need to do to stimulate these three triceps heads are found scattered throughout the overall size building workout routine that addresses all of your muscle groups.