That is purely subjective. I use AA#5, but just because it works for my stuff dosent mean that its the best for yours.
The only way to really tell is through trial and error. Use pulbished reloading dataand start there. Keep good notes and record everything. Shoot mutiple groups with the same load and record it. Then try another load. Eventually one will stand out above all the rest.
If its at all possible, use a versatile powder. Accurate Number 5 is great for most pistol meduim powered loads. You might try Bullseye or Unique as they are as versatile.