Trade or Invest depends on your skill level. What is difficult to say? If you invest long-term, you will get high returns, but on trading you need good skills, knowledge to update daily to be able to get the desired profit. I do not bias trader and invest. That's your choice.
In the case of bitcoin and some other top 20 altcoins i think i investing is better because at bitcoin we can see the rise and fall of the price curve itself, so we'll know when to invest in buying stocks and when to sell stocks. While if we trade it can be profitable but on the other hand, we have to work alone by peddling merchandise, unlike our investments that can sit back while waiting for results.
Exactly when investing in a portfolio we need to monitor it closely. Maybe it will rise or fall soon. I advise people to own up to 10 altcoin. That's the right amount to manage. If we are too big we can take more time to manage them.