I've not used Neue Scheule, except had their Mors Lotte Pelham which Minnie didn't like so sold it (but that was more the type of mouth piece rather than bit), but have pretty much always had her in Sprengers from a 4 year old and I wouldn't use anything else for her now, but that's just her (my last mare was much simpler and cheaper and only went in Happy Mouth bits - Minnie of course likes to be high maintenance
I've got the WH Ultra Soft same as Wendy and Minnie goes better in that than she used to in her KK. I buy mine from an Ebay seller who imports from Germany, as much cheaper - think I paid around £70 for mine, but they normally retail much higher.
Having said that my friend has used NS bits very successfully on her mare, so it is horses for courses.
Weirdly on the pelham front Minnie loves her dirt cheap jointed Mark Todd Rugby Pelham, although I have occasionally had my eye on a Sprenger jointed pelham, but they are seriously expensive, so I have resisted so far.
The quality of Sprenger bits though is indisputable. Minnie's original KK bit is now about 10 years old and I still use it for my lunge cavesson. Wasn't there some issue a while back (long while) about NS bits breaking? Am sure I read this on here a few years ago now.