If you choose to do curls (which I usually don’t) you might think about alternating them.
Basically, the amount you can lift with two arms together is less than the sum of each arm individually.
Example:
Right arm curls 30lbs
Left arm curls 30lbs
BOTH arms together curl 57lbs
This (in science) is known as the bilateral deficit. While there are many explanations why this might happen the main thing is that you can lift more while focussing on one arm at a time. More stress on the muscle MAY result in greater growth.
Keep in mind this is all in theory and does not always apply in the real world.