Describing a shitcoin varies from person to person. An alt that made you good money doesn't mean that it's a promising one. So please be honest, and if you ever have to sell your btc, what would you buy with them?
My first vote to Monero, for privacy reasons. Fuk ZEC and its "optional privacy" which is NOT a privacy actually. DASH? Lol, no privacy. Another bitcoin clone methinks.
Second one is Ethereum, there is no serious competitor in smart contract area.
I cannot find third one. Maybe NANO.
You are just expressing what many members of the forum think, despite the thousands of coins that we have in the market if you take a serious look at many of them you understand that they are not worth anything and there is not a reason for you to sell your bitcoin to acquire those coins, this is probably the strongest reason why long term holders are only holding bitcoin and nothing else.
If they decide to invest in other coins most likely they are doing this not because they believe in that coin but just to speculate with it and then get more bitcoin in return, my conclusion is that if you are happy holding your bitcoin do not waste your time with altcoins.