Of course, first of all, its Bitcoin. Whatever characteristics other altcoins might possess, this is just an attempt to improve Bitcoin. Cause bitcoin is an idea.
Of the altcoins for a long term investment, I primarily consider the Ether, Ripple, Litecoin and Monero. Monero is the most popular anonymous cryptocurrency and I think it will be so in the next few years. All the other coins I have proposed have excellent development teams that are constantly working to improve their projects. They are also quite popular, which indicates their importance.