In my opinion, the best penny is Bitcoin in the long run
If you trade Bitcoin, you will benefit greatly.
Therefore, I recommend using Bitcoin as a smart choice. Also if you want to invest in some other currency you have to study carefully before making your own decision.
good luck.
I am not sure that Bitcoin will give the better profits. Meanwhile, all the guys that are also interested to find the answer to this question should watch these video instructions:
https://www.youtube.com/watch?v=Q4KshTJPK8M