I dont find the concept of copy-trading to be something profitable. I prefer doing my own research and then placing my trades such that if I lose money I know whom to blame, myself. This gives you confidence that you are in full control over your profits and it is not that someone is being a big guy and telling you how to trade.

Besides, if you are trading on something without knowing what is the basis you will never learn but be like a machine copying someone. That movement which the bigger trader saw in order to start that trade, may have already crossed its time and hence you buying/selling after that may be a wrong move.

I prefer doing spot, but if someone finds copy-trading to be profitable, by all means go with it.