Everyone has a different choice, depending on which point of view we decide, I prefer some mainstream currency, think BTC, LTC, and I think these COINS will maintain and grow steadily.
Yes, for me I like Litecoin, Bitcoin and Doge coin, Like they said main stream coins has steady and grow stages. I prepare Doge coin because of low price but someday it will grow like other coins. But bitcoin is one of the high value coins like others. Those who have started way back that the bitcoin has started, it's good for them because they hold that longer until now.