I don't own many Brass Libraries, but I'll try and list my favorites:
1: This is a tie between CineBrass (Core + Pro) and Cinematic Studio Brass. I find that they complement each other extremely well and help cover each others' weakenesses.
Cinematic Studio Brass is outstanding for your really loud or punchy lines, and also for passages that alternate quickly between shorts and sustains. Despite the limited ensemble sizes, the horns, trumpets, and tenor trombones can sound perfectly sized. It's the low brass where this library is really disappointing, in my eyes. It's great for bumbling, tumbling, flighty Williams-esque writing, but for anything loud and biting and overwhelming, this ain't it: it sounds way too small.
This is where CineBrass comes in. It is overall mellower and softer in tone and dynamics than CSB, and sometimes, I end up preferring using this for supporting chords in an orchestration over CSB, because sometimes CSB doesn't get as mellow as I want. The solo horn legato in Core is an especially good example of this - the sound is just superb. CineBrass also does low brass exceptionally well. It is loud and punchy and sounds just big enough in Core, and in Pro, with the Monster Low Brass ensemble, it sounds absolutely huge, and you can really get some incredible blasts and stabs that you just can't do with CSB.
2: Hollywood Brass. This is a close second for me. The horns and trumpets are old favorites of mine, it's just that the way the articulations is organized isn't as intuitive for my workflow as it used to be, but I definitely still love using the legatos and shorts sometimes.
3. Metropolis Ark 1 & 2: I don't use these as much, mainly because, like HWB, I find Capsule's articulation manager a little cumbersome for my workflow anymore, but they definitely still hold up, and they're a great option for me to have handy. You can get absolutely huge sounding lines and chords out of Ark 1, and really soft and pretty lines out of Ark 2. They're complement each other so well.
4. Symphony Series Brass Ensemble: I don't use this one at all anymore, mainly because there's too much reverb baked in, and the articulations aren't as consistent as I'd want them to be.