What is best according to you? Bitcoin or Altcoin?
If I have to choose only one, then I would go to bitcoin ecosystem. Simply because the market is somewhat stable with a lot of investors willing to pour their money anytime and I don't agree others think of it as a bubble.
Altcoins though give you much return, however, you need to ride the waves of the pump, otherwise you can't maximize your profit, and will just get few hundred dollars when you can earn thousands or more with bitcoin market.