...I think the most profitable is the swing trading while the most difficult is the scalping which is made only for the advance traders or who has lot of time to spend in front of the screen.
In any case, it will depend on whether the trader adheres to the risk management rule or not. It must be remembered that the main task of a trader is to save his deposit, and if he learns this, he will be able to earn money in the future thanks to his knowledge and experience.