Many people say different altcoins are better than others but I don't really see any proof as of yet. What altcoin should I invest in? How do I know if an altcoin is succeeding? I have many questions, but I can't seem to find an answer easily :S
Did you know 4 years ago how good Bitcoin actually is and how big will become?
No.
That's the same with the altcoins. Some are only clones, some have wonderful features. Some have good advertising, some not. Some have a good and healthy community behind them, some not.
Some will get big, some not.
To find which will get big and how big... you may need a crystal ball...
Obviously everybody will tell you that the currency they make or they own is better. It's something between advertising and psychology.
There are so many altcoins you cannot just check them all.
So... just pick one of the active altcoins, hang with the community, learn the internals, see how active the devs are... may take you months. As soon as you find a flaw or something you don't like, drop and move on.
In a year or so you will have 2-3 altcoins you'll love.
I don't know a better way for this.