I agree with you on this, altcoins are more profitable than bitcoin base on the fact that bitcoin doesn't move so fast like altcoins that can turn 100% within 24hrs
The opposite of this is also true and you should also show the other side of the picture. Just like altcoins can move up more quickly than bitcoins, the altcoins can dump very fast too and they can make your portfolio even zero. Bitcoin may not give you very quick profits but it is a safe investment when compare with most of the altcoins.
Altcoins is too risky as an investment for long term, when you invest on altcoins, you should not be greedy enough to hold longer, always find the best timing when you are satisfied and sold what you have and then reinvest when the price dump or reach again its dip, that's the lesson I learn from the last bull run and after the bull run when is the long correction period.