My experience is that Stans rims offer a tighter fit for all of the tyres I have tried mounting on them. Most of them I have been able to seat with a track pump with no issues, and have held air for extended periods of time without the need for sealant - a benefit of the tighter fit.I'm about 175 geared and have ran arch's for 2 plus years on my Canzo. Rear is toast and will be going with flows on the new build (I've since gone to a Nimble9 HT). I have noticed a slight amount of flex on both the front and rear, kind of wrote it off to Ti Qr's. Hopefully the flows will help with that. On the conversation about certain tires going on Stans....either I'm a big wuss or ALL tires are a PITA to mount on Stans wheels.
I have used Nevegals tubed and tubless, WTB's and Ardents...They all SUCK trying to install on both the arch's and 355's on my SS. I had mistakenly put a GEAX saguro on the arch...had to cut it off to remove it. I have broken countless plastic , aluminum and steel tire irons.
Again, not sure if it's me or Stans? Open to suggestions.