I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been 'pasted' on the IC. What is the difference between these types of Naming methods? does these 3 types differs in quality? or somewhat...
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