There are a lot of good barbecue places in Texas. I'll let you about some of the ones in Dallas-Fort Worth. As a conversation starter, I'll comment upon the places in the Eater article below. I'll also mention some places not in the Eater article.
The metroplex’s top destinations for barky brisket, snappy sausages, and a truly impressive bounty of side dishes
dallas.eater.com
I would pick 1-2 of these suggestions based on what's convenient to your route and other plans in the area.
Cattleack is really good but is only open from 10 am - 2 pm Wednesday-Friday and the first Saturday of every month. If you want to go to Cattleack, you have to plan your day around it. It is in a bit of an odd location in North Dallas.
Pecan Lodge (not featured in that article but generally well regarded), Terry Black's, Lockhart's, and Off the Bone are all good choices. Of those, I've only been to Pecan Lodge. Pecan Lodge is good but a bit overhyped. I've been a few times but haven't been in 5+ years. Pecan Lodge and Terry Black's are both in the Deep Ellum neighborhood and parking is very difficult to find there.
I like Heim Barbecue a lot. If you are flying into Dallas on Southwest Airlines to start the trip, one of their 3 locations is right next to the exit of Dallas Love Field. That's a great way to start a trip. I've picked up people from Dallas Love Field and taken them to Heim before. I've even gone there as I've gotten home from a flight. There's also sufficient parking. I've also been to the Magnolia location in Fort Worth before and it's in a hip part of Fort Worth. Parking is a little challenging there too but I'd rather try to park near Magnolia in Fort Worth than in Deep Ellum in Dallas. Unlike Pecan Lodge, I've actually been there recently.
I like Angelo's in Fort Worth a lot too. Angelo's has been around since 1958 but some think it's heyday was a long time ago. Every time I've gone, I've liked it.
Hard Eight is another good barbecue option. There are a few locations around Dallas-Fort Worth but I've only been to the location in Coppell near Dallas-Fort Worth International Airport. It's a good choice if you're near DFW International.