some old coins are dead, some still survive, I think new coins and old coins have the same potential to grow, the difference that I see is that new coins don't dare to speculate in big prices. if there is a choice which I have to choose, my choice is still the same, that is, in the old coin, because it is more secure to survive.
You're right, new coins are very easy to manipulate so if you want to trade it's better to use old coins. This is not a question of how much profit we can get, but about how much risk there is. the market is still bad, and strange if we talk about big profits. so it's better to play safe or you will be disappointed.