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.
I will buy more ethereum or low price coins like grin, atom, trx, or ada. But that will need to observe and analyze more in the market because I need to find out more about which altcoin will be potential to increase later. I think every altcoin can be potential, but it will need time to find out the right coins, and I feel the market still unpredicted. But I don't want to sell my bitcoin to buy altcoin because I already buy many altcoins in a few weeks or months ago, so I still hold some altcoin which I think it will be potential to increase.