Michael, I agree with Herb that Kontakt is the best. That along with SampleModeling instruments will give you the most natural sounding brass sounds. But they each cost considerably more than JABB, as do all good sounding MIDI VSTis or synth hardware.

If you are thinking you can take a BiaB brass MIDI track and use a good sounding brass VSTi that you will get a realistic sounding brass section you will be disappointed. In order to get good sounding MIDI tracks you must know how to use MIDI. Continuous Controller (CCs) and pitch bend are a must to obtain good sounding tracks. Even those old formats, especially if used as stabs, may be acceptable to you if you use CCs and pitch bend. Sorry for the redundancy if you already know this.

The bottom line is more money along with a working knowledge of MIDI will yield the best sounding MIDI tracks.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware