Both could be profitable depending on our skills and the coins that we're investing or trading with. As for me, we could do both at the same time but we should have enough knowledge on how to deal with the market so we'll never have regrets in the future. It's your choice because if you want to gain a profit in just a short period of time then trading would be the best for you.
We can really have both if you do know on what you are doing but of course it would really be needing more capital for this one.Investing is for long term and
trading is for short term and you are right that this will really be needing skills and experience for you to do both things in more efficient way.
Both does have advantage and disadvantages to each other but why would really need to chose if we can have both and make most money on it.
Sounds easy but it wont really be that simple.