A combination of both methods work well,if strategically managing a portion of your overall portfolio for trading allows you to invest for growth over the longer term.
If trading is already working smoothly for you, why divide your attention to investing in stocks? I know it's necessary to invest in something that's big enough to make one smile other than depending on just a project that's yet to signify our standings in the system.
What sector would you prefer? Well I'm sticking to trading because I'm acquainted with the system, I know the in and out of its operation so there's definitely nothing to be scare of. We bring ourselves to spotlight when we decide to fight for a change, atleast to stay positive for every big thing coming our path in the system.