I started looking into these things about 3 or 4 years ago, and have come to slowly accept that samples will never quite sound like the real thing, especially solo instruments.
This is because a solo musician will produce subtle variation in their timbre and vibrato with each note that can't be replicated in a sample library.
As far as I know, there are no woodwinds libraries that have successfully produced a crossfade from non-vibrato to vibrato.
This is for technical reasons. If you overlay two samples of differing vibrato, you get phasing effects, which sound horrible.
The only way to overcome this is to use sample modelling (eg. SWAM, and Vwinds).
Performed with a breath controller they are pretty good, but just lack some of the richness of a real recording.
Berlin Woodwinds is widely regarded as "The best" available today, with Cinematic Studio Woodwinds as a worthy contender for that title.
But Berlin Woodwinds only has a single dynamic layer and baked in vibrato.
(so it's completely non-adjustable).
I'm content with Cinewinds Pro for my woodwinds for now, but if I wanted to upgrade on soloists, I might consider Musical Sampling which have some great solo woodwinds with true legato.
I bought the Herring Clarinet on sale, which I think is probably one of the most convincing solo clarinets available.
If you're only doing a small volume of music, and just want a soloist for a small part, you might consider hiring an actual soloist from Fiverr. They can be quite affordable, though the quality will vary.