Well, for forex...I'm not into scalping...there's to much volatility for bad %ROI vs Risk. I left , Futures, due to bad volatility when market broke that last highs. After what, when to stocks, swing, options ( but demand lot's of capital for selling...), ended with Forex , cause I was told, if you learn how to trade forex, you are the "king" lol... but it took me lot's of time to adapt. About a years and half... ended by learning and create my own system and methodology of market. I personally think...there's no best instrument. The key, it's to find what fits your "vision of desire life style"