What is difference? The name of IC's are punched or printed or stickered on top of it
There shouldn't be any difference in the performance of the part, so no difference in the quality or the operation.  

If you want to get super super technical about it, I guess a part with a punched plastic package would have different thermal dissipation properties over the printed parts but only on the most minute order.

To be honest though, if you bought parts from china or something that are stickered, I would be skeptical of counterfeit parts.  Although counterfeiters have capabilities to etch and print as well.

TL;DR: Buy from reputable suppliers