Maybe others have had wonderful results with SGS, I've had absolutely terrible luck with them.
What finally turned me against them is a 304SS job, milling an O-ring groove. Was going through SGS endmills like crazy, and on parts I couldn't afford to scrap. On the first part of a batch, the SGS endmill broke 1/3 of the way through the groove cycle. I was out of them, so replaced it with a Dataflute equivalent.
I ran the rest off the job with that one mill.
Two brands I dislike are SGS and Melin.