IMO, Yaqi synths are very good but some are better than others. Which ones are better will be down to the individual's preferences.You're probably right, but there is a "scritch" difference between the Mew Brown (SynBad) and their Cashmere with the latter having softer tips. These two are my "workhorses" with the latter being my favorite if pushed to decide. The Mew Brown works a tad better with harder soaps and with more than a day's beard growth due to its having a tad more backbone & "scritch" IMO. YMMV.
One thing for sure, YaQi synthetics will "kill" any desire for other brushes as they work that well!!
Like the above, I have 2 Yaqi brushes which I favour more than the others I own. The Mysterious Blue Fan Tuxedo has the lowest glue bump, is a little floppy but dense enough and it works really well with creams. Faux Horse/Rainbow handle has good backbone, still splays well - it's the brush I use for harder soaps eg MWF.