That depends. If you want to build muscle, the number one tricep workout is one where you can use the most weight because more load equals more size and strength. Tricep activation exercises where you can do more volume to create maximum pump is the same for most muscle groups, not only the triceps. If you were to do one triceps workout, it needs to include exercises like the JM Press, dips, and close-grip bench press for load and overhead triceps extension, and pushdowns for the pump.