I believe there are some altcoins that are technically better than bitcoin, but the problem is they do not have a large infrastructure that takes years to build it. They do not have thousands if not millions of people invest, in addition to many businesses, programmers, etc. And the only real way to build infrastructure is to be the most popular coin, at least in the current situation. Then as cryptos (hopefully) get more accepted we will see some coins competing against each other and become worthy of the currency, but now Bitcoin will remain Number 1 for the future because of the infrastructure it has.