I have a BTO GA Adi over EIR with an Adi brace and I love it. From the first time that I played an acoustic with an adirondack top I knew that was the sound I wanted, which sounds a lot like what you're looking for. To me, the Adi top brings more volume, clearer tones and greater overtones, and you can really dig in and push it if you want. I'm not sure how different the Adi brace would make a Sitka top, but to my ear the Adi top brings a significant tone difference. Obviously we all have our own opinion on what sounds the best so you would need to play them both to decide for yourself. Good luck!
Here she is: