I'm still voting for Altina because I feel a free astra mythic is the best outcome for most people (worse case, it's an extra 16 points per week, unless you whaled for +10 Altina and Naga already).
I don't see myself using most of the non-mythics. Leif will be a merge for me, which I'm fine with because I like my FE4/5 units, but Snowthis, Edelgard, Alm, and Azura? Eh. I just don't see myself using Snowthis and I had the others and never used them. My PvE is completely FE4/5 themed, and I find most "broken" units aren't consistent in PvP without serious investment, so I'd rather take a scorebot, with astra>dark>anima being my preference. Edelgard is the one I dread the most, the unit aged badly (for PvP content, just use Raven for AR-O/arena or B!Ike for AR-D).
Having everyone, including new players, with guaranteed access to the best dancer in the game is a good thing. Specially since the alternative to her is the very mediocre peony.
Altina is still the best option of those, but saying that LAzura is a bad choice is absurd.
How is Peony mediocre? I honestly find her better than Azura, ngl. Prayer Wheel makes Azura the better dedicated buffbot than Peony, but there's other ways to get buff so it's not a huge factor for me. Azura's +1 movement on her dance target feels comparable to Peony's global omni-orders, and can often emulate a lot of the same plays. And Gentle Dream being able to give +3 visible buffs
across the entire map is actually very clutch for cleanup; that's a play Peony can do that Azura just can't. Also, Flowers of Joy is great.
Like, Azura's fine, but I find the fact Peony is more oriented towards buffing the entire team rather than just the dance target honestly makes me prefer Peony in almost all cases. Just use tactics and/or links for the other buffs.