With taking the description of what Investing and Trading maybe according to your view, I am rather no going to .ake any contrary review on what difference it could be at my end.

Which one is better if I want to invest and trade bitcoins.[/quote]
With after learning and acquiring the affirmed cryptos basic skills, then you have realized that there are two categories of investments in the industry which are the Investing and Trading, it is then left for you to decide which one is best fitted for you depending on your investment capital and your goal of investment if a long-term or a short-term investment. You have already aware about the risks and the rates of income involved do don't get convinced by anyone recommending you to one because you might be unfit in time to hodl for a long time or unfit to taking the risky decisions.

However, as you insinuated that you want to trade and Invest that is to say you want to go into two of the affirmed Bitcoin categories. That is always a safer choice making if one could have a long-term running investment that is projected for the future with no point of compromising the long-terms goal with the ability to hodl for the period of specific long-term and also have a short-term investment that is to offer quicker incomes so as to support your financial needs.
So, I would say if you think your capital is enough to ride on the both sides then you are good to Invest and also Trade on the Bitcoin investment.
Money funded in investments with the goals to generate more money is never a waste.
Good luck.