The Southern League has the highest walk rates of any minor league. Pitcher control and defense improve significantly at AA>
Double-A leagues are more similar in their run environment than A+ or AAA. The Texas League is the most hitter-friendly. The Southern League features a significant divisional split.
Run environments over time at the High-A minor league levels. A comparison of High-A with Low-A in terms of defense and pitcher control.
The minor league run environment in the Midwest League and the South Atlantic League.