Probably the best bot is the one you can code on your own, many bots come with preconfigured strategies and while they give you the option of customization very few do it as they see bot trading as a way to make money with no effort, if you can code your own bot then you can be completely sure there is no hidden code stealing your strategy or that can potential steal your funds, but what if you cannot code your own bot? Then you should trade manually in my opinion.