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No need to go too far into research. The top coins are there to tell the story and your required answer.
Check in CMC.
In my own experience, I just do it all in bitcoin with minor amount to alts.
Obviously, you need to research more before investing in cryptocurrency. Because there has not always in win win situation. You have a chance to lost your funds. So do that thing which already matched with your research. I prefer to trade in altcoins.