They are all subject rise and fall even the king BTC. I personally think that the mining pools are going to collapse all of the PoW coins eventually so I am going in to NODEcoin until a better alternative to PoW is found. I have heard other opinions on this and various other aspects of cryptos and the best advice I can give is. Do your research, actually read the white papers including Satoshi Nakamotos original paper (they are not fun but they are worth it), find something you believe in, then invest in it because you believe in it not to make a quick buck. When you invest to make a buck YOU are the pumper/dumper. Also only invest what you can afford to lose and hold on and don't pull out until something that you believe in more comes along or your research leads you to stop believing in the project.
Happy investing,