I'm just a hobbyist, not a metalurgist, so I just go for whatever I scrounge up. After years of collecting machinist chests I've got a single chest full of end mills in different sizes, flutes - square end, round end, roundover etc. Whatever is sharp works for me. I don't usually look at the maker but just went and grabbed a handfull and most of those were weldon or b&s so I guess that's what was preferred by the pros way back whenever.
Joe