The Southern League has the highest walk rates of any minor league. Pitcher control and defense improve significantly at AA>
AA Run Environments: The Metes and Bounds of The Southern League
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.
High-A Run Environments: The Runaway Cal League
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.
Sally and the Midwest: Minor League Run Environments (A-Ball)
The minor league run environment in the Midwest League and the South Atlantic League.