I haven't done any direct arm work for quite a number of years. The arms seem to respond very well with the basic exercises, without special attention, for me anyway.
I believe that too much special attention to curls, triceps presses, etc actually may slow down progress in getting arm mass for a lot of people.If insisting on doing arm work than a couple of sets, three on occasion, should be all that is required. Going with the common logical theme, biceps with back or any other pulling movement. Triceps with chest/delts or any other pushing motion.
In my beginning years of serious training I included direct arm work. Favored BB curls & French presses (DB's). To be honest, for me, any direct arm exercise is one of the most boring things in the world. Met a lot of lifters & BB'ers over the years and learned a lot about what worked, and did not work, for them regarding arm mass. Came to the conclusion that one method never will work for all (like anything else in BB'ing). Though the BB cheat curl and the straight up dip (never leaning forward) can produce the most mass, in the shorter period, for quite a few.
Someone (sorry can't remember the name) suggested close grip chins (in another thread), which is one of the finer exercises for the biceps. If preformed the correct way. Good Luck.