It depends on a level of investment and profits you want to achieve, as well as the time of your investment. In short-term perspective better to look at the level of market and trend. BTC will give you the best profit in 1-1,5 month;
ETH now in stagnation and you need to search for closest announcements and huge updates. Now ETH price is close to the end of the year.

So you need try and learn.