Brazilian and Argentine giants, and the genus that produces the whiteknee, which is most of why anyone knows the name. Large, terrestrial, fast growing by New World standards, and enthusiastic about everything: food, webbing, urticating hairs.
They are display animals in the literal sense. Where a Grammostola sits in a corner for six months, an Acanthoscurria is usually out, usually visible, and usually looking for something to eat.
Sac sizes are large and captive production is consistent, so the whole genus sits low on the price curve relative to how big these animals get. That value per inch is the reason A. geniculata keeps showing up in beginner recommendations despite kicking hair at almost nothing. The less common Brazilian species trade higher on thinner breeding rather than any real difference in difficulty.