What is the difference between bitcoin, dogecoin, litecoin and peercoin?
You only need to know is that bitcoin is the only coin may success.
And the others are just shit.
Just like waterpile said there are some alt that can be invested in right time and make profit from it. Also there so many scams it easy to view them. Most of the new coin that are said that they are not primined or just 5% are scams, it more reliable coin that said its 50% premined.