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.
To be honest if I ever wanted to buy an altcoin using bitcoin then it will be only BNB based on current market conditions since its the coin have better future in near due to binance has no competitor at all for now.But other coins which based on its usage might be moero other than that I will skip everything just hold btc.