I have a newer BT-99 with choke tubes and adjustable stock. It's my first shotgun. I'd highly recommend it for anyone wanting a dedicated trap gun. It's robustly built, easy to clean, and will do just as well for you as one of the fancier guns costing thousands more.
I can't comment on the Browning chokes as I've only used the stock Browning full choke so far. I haven't patterned it yet, but I'm hitting 22 targets on average per round and I've only been shooting for 4 weeks now. I plan to try a Briley soon.