Where I live, Sapim and DT Swiss are available (mostly sourced from Germany), but Wheelsmith is not.

I prefer DT Swiss classic nipples, because they don't have a conical head (so they distribute the load on the rim over a wider area), and because their threads let the spoke protrude more - so there's less chance of having the nipple's head be unsupported by the spoke, and break off. Sure, if you get your spoke lengths just correct, ideally, that should not be a problem with Sapim either, but with DT Swiss I have a bit more of a margin for error (and, besides, I usually get spokes at 2mm length difference, at best).


Niple thread lengths for Sapim and DT Swiss brass nipples

That bit of "OCD" aside, both Sapim and DT Swiss make good quality nipples.

Relja