Astra of Mesa (The Ram) Affinity: Fire, dynamism
Dexterity +1, Constitution -1, Intelligence +2, Wisdom -1, Charisma +1
Astra of Vrsabha (The Bull) Affinity: Earth, fixation
Strength +2, Dexterity -1, Constitution +2, Intelligence -1
Astra of Mithuna (The Twins) Affinity: Air, mutability
Strength -1, Dexterity +1, Intelligence +1, Charisma +1
Astra of Karka (The Crab) Affinity: Water, dynamism
Dexterity +1, Constitution +1, Intelligence +1, Charisma -1
Astra of Simha (The Lion) Affinity: Fire, fixation
Strength +1, Dexterity -1, Intelligence +1, Charisma +1
Astra of Kanya (The Virgin) Affinity: Earth, mutability
Constitution +1, Wisdom +1
Astra of Tula (The Balance) Affinity: Air, dynamism
Dexterity +2, Intelligence +1, Wisdom -2, Charisma +1
Astra of Vrscika (The Scorpion) Affinity: Water, fixation
Strength +1, Dexterity -1, Constitution +2, Wisdom +1, Charisma -1
Astra of Dhanusa (The Archer) Affinity: Fire, mutability
Strength -1, Constitution -1, Intelligence +2, Wisdom +1, Charisma +1
Astra of Makara (The Goat) Affinity: Earth, dynamism
Strength +1, Dexterity +1, Constitution +1, Wisdom -1
Astra of Kumbha (The Water-Bearer) Affinity: Air, fixation
Strength +1, Constitution +1, Wisdom -1, Charisma +1
Astra of Mina (The Fish) Affinity: Water, mutability
Strength -1, Constitution +1, Intelligence +1, Wisdom +2, Charisma -1
In addition he informed us that our sign will not determine our personality. That will be decided by prologue choices (and we are starting as a kid).
Archer>Twins is my current preference. I'm partial to the mutability astra type, and it helps that both of these fix our negative stats, letting us play as a solid all-rounder. Failing both of those Fish is my third pick.