For Ethereum Classic, Bitcoin Cash, and Horizen, I must say no. I never hold them because those altcoins are not worth it to hold for me.
Altcoins are risky to hold, if you are in bear market. After bear market goes away, bitcoin will be the strongest survivor and rallies the most. Altcoins mostly lose their price and have worse rallies compare to bitcoin. You can see Ethereum that roughly touched their 2018 all time high but if you hold it in 3 years, you lost in total BTC you used to buy ETH in early 2018. You have an equalizer in USDT but a serious loss in BTC.
Horizen is one of privacy coins and with current drama and changes in policies on privacy coins, I would stay away from Horizen.