It is easy for the professional traders to use bots because they already know how the market works so they can set up a very good bot for trades so it will be serve as a duplicate of their self and earn money and also save time.
But if I am a professional trader, I will never think about using bots for profit making instead of myself. Usually I do not want to interrupt any well going progress, basically I may use bots to save time so that I can learn more in free time so that I can turn as a professional trader in quick time.
Even there are many bitcoin trading bots available, honestly I am afraid to suggest anything to OP. Because I'm not concluding any of them as best. Traders keep on giving mixed responses and experience about them. I believe this type of trend will continue as no bot will be consistent over time. Probably we will be having more bots will be added in this race but finding out one best bot may not be possible.