Im talking about only coins wich are all ready listed on Exchangers with decent volume!
Bitcoin
A coin that is listed on every exchange with the biggest trading volume. But to stay serious, there was no altcoin that made me happy during 2019. There were few coins that gave 100 percent over 2 days, but several hours later, they dropped as well.
In crypto market Bitcoin is the ruling community so it was listed in every exchanges and majority of the investors are always participate in Bitcoin so highly volatile coin and long term investment is good for any bleeding. Many altcoins are following the Bitcoin way so your disappointing situation will growing again. Future growing will make success on Bitcoin but fastest growing is hard to predict.