Have used all the brands, but gravitate towards Alliant and Accurate. Alliant, hands down, for handgun.......Bullseye or Unique for 9mm, 44 & 38 Special, 2400 for the 357, 44 Mag & 45LC.
Tried Accurate Powders, in the early 80's ,when they we selling at a fraction of the cost of the other brands. AA2520 is my all time favorite for 243W and 308W with J-words. Wouldn't hesitate to substitute AA-7, for the forementioned, non-magnum handgun cartridges.
No one has mentioned VihtaVuori. The ones that I have tried, I like,very much. Albeit, they tend to be rather expensive, in comparison.
Winelover