The Pacific Coast League has a long reputation as a hitter’s league. From 2008 through 2018, the average runs per game in the league has been 5.04, with a low of 4.73 and a high of 5.56. In 2019, with the MLB rabbit ball being used, that number has jumped to 5.60 runs per game!
The other AAA league, the International League, has averaged just 4.26 Runs a game from 2008-2018, so over three quarters of a run less. Curiously, in 2019, thanks to the AAA homerun explosion, the IL is averaging 5.21 R/G, as close as it’s ever been to the PCL.