I own both libraries, and would definitely go with (only) CSB if I could do it all over again.After experiencing the exceptional CSS and CSSS I went for the CSB. The one thing I have read in other musicians reviews is that CSB, in comparison with SSB, has a unique consistency and quality to each and every note. That paired with the amazing dynamics is what made it a go to library for many picky individuals. I have done some research concerning the SSB and although its seem to be a good library, it simply cannot match the close and big sounds of CBS – you can tweek it to what you like. And don´t get me wrong, I own several top notch libraries from Spitfire. The studio woodwinds is a treat! But when it comes to finding a genuine workhorse for brass I would go for CSB.
Best of luck!