Its good to do both instead of depending only on any single one as saving can take care of your expenses at the time of emergencies and investment will help you in growing your money in long term so I think both are important.
Being a trader both are important because in case of any disastrous situation one can make use of his investments and savings to escape from disasters.
What we can do is to invest there, where you are damn sure that you will not experience any loss and save a small ratio from each and every profit you get.