For me Dogecoin is the most stable altcoin.Dogecoin is a altcoin from 2014 and still have value.The dogecoin community is big and very friendly.You can watch on reddit page of dogecoin you will find the best crypto fans.
I agree with DOgeCoin and the only thing I found of DGE that is made it one of the strongest cryptocurrency in the crypto market today is it's transaction speed.
DogeCoin is fast and faster than almost every crypto networks today and that leads DogeCoin it's main advantage.
I invested DogeCoin last year on 3rd quarter and today I am happy because it offers me higher rewards than my other altcoins.