the development of altcoins or their derivatives has been overwhelming, namely new tokens and ICOs whose manifestations vary according to fields but upgrading from bitcoin itself is still relatively minimal but from both prices bitcoin still dominates and is fairly stable
Indeed there is no way to keep an altcoin on top position as compared to the bitcoin. Bitcoin was first and whatever came out later on was just copy of few codes and new ideas. However most of them came out as money making machine coins, some of them came as idea which eventually dropped out of the market and now some of them are there with huge market just because many more other coins are being coded on them.
So altcoins can be weaker at anytime and thats why choosing bitcoin gives me more reasons.