The "best string section" is Meta-Strings, an ensemble made by putting most or all of the VSL string libraries together. This allows almost all articulations, divisi up to Debussy levels, portamento, etc. with sections and even individual players totally controllable.
Whether you can use Synchron Strings as part of that is not clear but perhaps with the MIR Synchron it would be possible though not with the kind of instant playability being advertised.
I was thinking something rather odd and vaguely disturbing in that Synchron is not only like the old East West orchestra -though obviously better quality - but FX Strings is like Symphobia-type libraries. This not only is a change for VSL but a reversal. I always thought that the difference between Symphobia stuff and VSL was that with VSL you create your own Symphobia, by using an amazing thing called... ORCHESTRATION.
What composers have always used. So it is ditinctively your own, rather than exactly the same sound that the other guy is using. But FX Strings is not only pre-baked reverb but pre-baked performances. That is Symphobia.
This probably indicates that VSL having cornered the serious orchestration market now wants the instant orchestration market as well, which probably makes sense from a business standpoint. Artistically, I wonder. For example, I am working on a "modern-horror" album which has various atonal sounds. If I use FX Strings for this, I am essentially doing what somebody else can do, instantly, by just pressing a key. The creativity of a composer is gone, and supplied by the wonderful creativity of somebody else - the people at VSL.
I feel that if VSL continues with this approach and creates more instant orchestration libraries, they are dooming themselves to an obsolescence that is so remarkably missing from the previous so-called "Legacy" libraries. (I hate that word! ) Because creating a representation of the vastly intricate, detailed and flexible instrument known as the Symphony Orchestra allows endless possibilites to emerge - even now at this late date in the history of music. But pre-baked performance sample libraries become old very fast for a simple reason - anyone using them sounds the same.
But all this seems representative in general of technology now - people are becoming weaker and more dependent while machines become stronger and more independent.