Is this a better tricep and bicep workout?

I use to just stick with 30-35 pounds dumbells and do 3 sets of 10 on them now I do super 7s or u can call its (21)s with the cable pulley with 70 pounds on it it. And I also do tricep pushdowns aswell with the cable pulley bar instead of tricep curls with dumbells. Should I stick with this or change it back to the dumbells instad of the cable workout. And which gives better results?
 
the bulk of your arm exercises should be free weights, not machines. 21's shouldn't be a staple either...rather a way to move past a plateu or sticking point in the range of motion. 21 reps per set isn't gonan build size or a lot of strength overall.
 
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