I spent some time trying to figure out if LH or RH hitting prospects had more of a learning curve in the majors (I have been watching too much of Alex Gordon, Eric Hosmer and Mike Moustakas). I thought LHH would struggle more, but I just ran into some sampling size issues and ditched the project.
One item I did find interesting was an aging curve for all hitters divided my handedness from 2007 to current.
RHH have a bump in talent at their age 24 to 25 season while LHH just decline. I am not sure why, but it happens.