I have tons of boars and all manner of badgers, but my horse collection is tiny, since so many of them are reportedly harsh.
But of all the research I did, the XS Zenith was by far said to be the softest horse option.
Whichever of the hairs is softer (maybe the mane), if it is increased too much, the brush is truly floppy.
You're not going to have too many soap buddies with War!!