For the last four or five years, I have been using Southside Market's Original BBQ Seasoning exclusively for anything I smoke in the pellet pooper or offset. It is great on brisket, pork butt, pork ribs, beef ribs, and chicken. I just finished smoking 10 lbs of chicken leg quarters with this rub and they turned out very tasty. Just like I remember when I was a little kid in Central Texas.
Now for steaks and hamburgers on the gas grill with grill grates, I use Southside Market's Smoked Steak rub exclusively. I think they use smoked salt in it because it gives steak a really smoky taste, like it was grilled over an open fire.
These are the rubs that Southside Market in Elgin, TX uses everyday on every meat they sell (and they sell a lot....over 2500 customers a day on average). OK, not every meat because their sausauge is in a class by itself using only salt, pepper, and a tiny amount of cayenne.