wRC+ for the 6 playoff contenders
Red Sox (97 vs Lefties, 118 vs Righties)
Yankees (124 vs Lefties, 107 vs Righties)
Guardians (108 vs Lefties, 107 vs Righties)
Astros (118 vs Lefties, 108 vs Righties)
Mariners (103 vs Lefties, 100 vs Righties)
A's (101 vs Lefties, 108 vs Righties)
The Guardians have had the most balanced performance. The Astros and Yankees have shown meaningful differences. The Red Sox by contrast are extreme in the other direction. Of course the Red Sox don't have to worry about facing Sale in the postseason