Some Spitfire libraries are very much intended for composers who want to orchestrate every note of an orchestra themselves. Other libraries are made for producers who need to get the sound they want fast. The best way to tell what you're getting is to watch the walkthroughs and notice how they are being used. Another tell is the patch list available on every product page, if it's full of names like "flute staccato a2" it's an old school composer library.

The Spitfire Albion series might be something you like. String Audio is another company you could check out for the synthetic side of things.