On these narrow adjusters, there are quality differences in the alloy - a higher quality brake lever like tektro will use a better quality adjuster, although in many cases the look is identical.
We've got a drawer full of various spares but rarely see adjuster failure apart from on bso's, usually the plastic body/ alloy blade brake lever models - and these go directly into the recycling.
Higher quality levers usually have a wider thread, so a more substantial adjuster greater able to handle accidents. The material is also clearly superior.