I wrote this to another reply, so rather than reinventing the wheel, I'm adding it here.
I'm moving to DBS in September (a diversion from the world of focused ultrasound, which I had too many tremors on BOTH sides to qualify for). Focused ultrasound has a lot of positives, but if both your hands are going, you will find FUS only works on 1 side. The other side gets fixed with DBS. I chose DBS because FOR ME there was no point to do 1 and then do the other anyway. I found the doctors at Penn Medicine in Philadelphia were and are very knowledgeable / competent with both DBS and FUS, and they have left me relieved to moved toward DBS. I don't say that lightly since DBS is a big obstacle for me (i.e. scared). Nevertheless, I go forward confidently, as does my wife, parents, family, and friends.
Please let me know if I can be of any further assistance.