Nothing against CG -- they're quite nice -- but since you asked about other guns in the market segment...
The new Fausti Stefano guns are worth a look. They're finally selling some of their own guns in the US, under their own name, to their own specs.
http://www.faustiusa.com
They have a narrower O/U product offering than CG at the moment, but they're nice guns from what I have seen.
Franchi's O/Us are similar in fundamental design to the CGs if you want an ultralight field gun at a lower price point.
Personally, I don't
love the under-barrel lockup of CGs and Franchis, but they have trunnions instead of a big Browning-style hinge under the barrels, so they're lower in profile than the Superposed-based guns, at any rate. (The Superposed was a clunky anachronism even when introduced 3/4 of a century ago, but 1/4 century after the Boss patent.) CGs have
fine fit and finish. In subgauges, the receiver proportions due to the lockup are much less of an issue than in 12, also, and I'm not in the market for more 12s. So, the nice CGs have certainly caught my eye.
Still, for me, fit and geometry come first. Without the basic geometry and balance that I like, things like wood-to-metal fit and nice engraving don't matter. So if you're asking about CG vs. B&B, IMHO you've got some deciding to do, about what feels right to you. They're all different.