I do not think anybody has any favorite altcoin. Because the value of any coin is not stable. Any coin can ever give profits and losses too.By the way, all the coins are good but when the price falls, nothing can be said. Bitcoin is considered a good coin for investment.
That's why we call a good coin the one that grows more and is more stable. Of course all the coins fall, but there are altcoins that fall more than others.