To me, olives packed by hand aren't better just because I can see the stuffing when I buy them. I think that it's also a good sign of the quality of the product. It shows that the manufacturer really cares about their products and they're doing their best to produce something that's high quality.
I buy hand packed olives. I do because I know that ultimately, it means that the olives are better and will taste better. Unfortunately, when various stages of production are carried out by machines, something gets lost in the process. Every batch is the same, there isn't much effort put into it. It's bland and boring. Something made by hand on the other hand, it's bound to be unique and delicious.