I just built a UDS just for this kind of cook, been doing briskets on my 22 inch weber kettle for years now ans have it down pretty good. Takes about 10-11hrs for a full packer and I take it off at 195-200, let it rest for an hr. Any more time and it starts to become like a crock pot roast(soggy) and too tender. I like a lot of spicy for the crust so it gets a brown sugar chili type rub I make and love the less soggy crust.
Have yet to do a brisket on my UDS but cant wait