There are thousands of altcoins out there.
But Which of them are you confident about?
On which you will put your money into and hold it?
Why do you think so?
Can you select the best altcoins in the market?
Eg. DOGE, DRK, Stellar , ...
it sounds like "what is better: vine or vodka?"
There are a lot of currencies now and even if we take out from list all scamcoins(known and unknown) there will be a lot. they are specific and many are designed for their purposes. So there are no one "best altcoin". You need to find 2-3 and keep them together. It's the best way i think.