Runs = tickets documenting how much oil is taken off the location by purchaser (i.e. sold). Measured through a LACT unit.
Production = estimate of how much oil was produced into the tank battery. Measure tank battery levels etc.
If all the measurement is infallible those two numbers should match over the life of the well.
If a well is a low producer, they may not sell any oil in a given month and some months they may sell several months worth of production. If you have a real big tank battery they may allow more oil to sit in tanks because of weather (truck issues) or pricing. But over the long haul it shouldn’t matter which one you look at.
But “Runs” should be what you are paid on.