You knew this was coming. All numbers from 2014 NCAA fastpitch:
Run Expectancy Table
From the initial state:
Get the out at first, concede the runner to 3B: RE drops by 22%
Hold the runner at 2B, concede the runner to 1B: RE increases by 24%
The expected run difference is about 41%. All the usual caveats apply: going from general to specific, NCAA vs 12U, whatever else you can think of, YMMV and all that.
Get the out.
Run Expectancy Table
From the initial state:
Get the out at first, concede the runner to 3B: RE drops by 22%
Hold the runner at 2B, concede the runner to 1B: RE increases by 24%
The expected run difference is about 41%. All the usual caveats apply: going from general to specific, NCAA vs 12U, whatever else you can think of, YMMV and all that.
Get the out.