I don't want to give the impression that Miroslav doesn't have some great sounds in it. Here's something I put together using the Miroslav solo violin: Miroslav Solo Violin Test

It took a lot of work to get it to that point, but I think it's a nice example of what Miroslav is capable of. But it's also tailored to show off particular sounds of that instrument.

Looking through the Miroslav library, I can find a lot of sounds that are particularly good. The solo bassoon/short is expressive with a pleasant woody sound. The solo english horn is pleasant, but the vibrato trails off sooner than I'd like. The solo oboe expr 1 has an emotional sound. The cello section is lush lush, and the second viola section has a marvelous vibrato. The solo flugelhorn has some iffy notes, but it's really nice. And the list goes on.

I'm also m not entirely thrilled by all the sounds in GPO, either. In particular, the brass seems weak to me.

But if I had to pick a single library, I'd go with GPO. It's got some very nice sounds, and I think it's got the most bang for the buck.