Just looking at some team-by-team stats on putouts from a current league:
LF 242, 263, 276, 223, 244, 210, 206, 230, 237, 248
RF 228, 224, 188, 205,196, 195, 218, 191, 207, 195
So 9 of the teams I checked had more putouts in LF than RF, and it looks like the average is around 15% more PO in LF. That probably does depend on LHB vs RHB, and to the extent that teams use platoons, that would depend on LHP vs RHP. The team with the biggest LF>RF difference in my list above did use slightly more LHP starters than RHP starters. The one team with more putouts in RF than LF has almost entirely RHP.