Dogecoin has only one advantage: Elon Musk tweeting. If Elon Musk loses interest in Dogecoin so will everyone else. Cardano on the other hand has a whole team dedicated to marketing Cardano and improving it.
I don’t see any advantage on DOGE compare to ADA, that tweet is not an advantage but a great warning for the real investors, that only means DOGE are being played by the whales and that hype is not good for long term. ADA is a good project and I’ll choose this one because ADA will continue to grow and meet the satisfaction of many investors. DOGE can be play for short, but don’t hold this just because of Elon’s tweet, that’s useless.