The queen usually ends up at c7 anyway, so the differences are small nuances.
Qd8 is probably most solid
https://www.chessgames.com/perl/chessgame?gid=1768345
Scandinavian Qa5 v. Qd8 v. Qd6

I play the Anderssen 3...Qa5 & the Melts 3...Qd6. I Like both. I believe both are a decent defense for Black
The Qd8 var I'm kind of of skeptical on. With 3...Qa5, & 3...Qd6 Yes, those move do waste a tempo, however they provoke a response by White (Especially with 3...Qa5 ) I look at the moves as a form of baiting White into a known position.
IMO Qd8 doesn't really have that provoking nature about.
The more I play the Center Counter Defense and the better my chess skills get, I see more and more of the pros (why people like it) and the cons (why people don't like it)
Wondering what is people's take on the three Queen Moves for the Scandi after Nc3. I've always played Qa5 but am mulling a change to Qd8 or Qd6.