My opinion is that altcoins are still dependent with Bitcoin. We can prove that by looking at the most recent bearish market. Bitcoin's price is also dragging down the altcoin market. Altcoins are still growing and maybe in the near future, there is a huge possibility that they will take control of the market. For now, I can conclude that Bitcoin is still on top.
Bitcoin and altcoins both are best but in different situations and circumstances but i think bitcoin will take control of the market. Bitcoin is most accepted crypto currency in the world in comparison to Altcoin. Bitcoin's price is also higher than other crypto currency, and its price is also comparable with gold. Bitcoin is upgrade coin wher as other crypto currency are still in upgrading mood. Bitcoin is mainly famous for its decentralised nature and transaction facility. Bitcoin is also accepted by many multinational company.