After I posted this, my concealed carry course instructor who's in law enforcement responded that for practice, what's most important is to buy whichever round your weapon will eat consistently as long as they're US-made and not reloads.
Self/home defense is another story, though. He recommended 9mm Speer Gold Dot 124 Grain 23618. Searched online and found that these cost a lot more than either Winchester or Blazer: 20 round box of Speer costs about the same as 100 round box of W or B. Price difference makes sense considering application. Saving lives makes them worth it.
Glock 19 G3, Advantage Arms L.E. 19-23 kit
Mossberg 590A1 Persuader 12g 18.5