buy doge coin and hold long time is ok because dogecoin in now low price and good coin
buy DASH hold long time is very bad
bitcoin is obvious the go to coin to buy and hold for long term and use and all that good things.
as for altcoins i agree on Dash to buy and invest in but not Doge because it is not a good coin at all. it goes up from time to time but over all it is dying and going down in price.