S&B are the Rolls Royce of optics, but from personal experience they score a C+ in robustness.
It also takes a very long time to get one back from warranty work.
With Leupold you are in very good hands (quick turn around if there is a problem).
With Nightforce you can pretty much rule out repair or warranty issues.
I'm a Nikon guy BTW!
Really? The last few scopes we sent to NF for reticle repairs or warranty work were all returned in less than 30 days. Best turn around was 2 weeks.