I've always heard that it really depends on your body type.
Like I knew guys who couldn't pack on mass without using high weight, low rep exercises, and I knew guys who already had mass, but couldn't tone up without using low weight, high rep exercises.
If I recall those are two of the muscle groups (along with abs) that can be trained every single day. This is the reason Bruce Lee's forearms were dramatically bigger than his upper arms. With this in mind, I suppose higher rep might be better for a non-professional body builder.
Ronnie Coleman talked about this briefly when he reviewed a forearm curler a few years ago. He said the problem was that it required a thousand reps in order for him to get any effect off of it, and that to pack on mass he really had to forearm curl heavy weights for low-reps. Granted, most of us aren't Ronnie Coleman. lol.