Disclaimer - I really don’t know 
But my dad told me it was worse to overfill than to under-fill a little. His reasoning was that added pressure would be put on the engine seals. Makes sense to me, and certainly doesn’t hurt to be careful not to overfill.
When I discovered a year or so back that my local tire shop, who did the cheapest oil changes in town ($24) was overfilling my vehicle by 3/4 qt each time, I started doing it myself again.
I also decided to start using full synthetic, which would make it a lot more costly to pay someone else to do the work - at least that way I felt better about having to do it myself again after a few years of feeling rich.