I've probably used
Dizzy Pig rubs for the longest as Chris, WooDoggies and I hung out on the original BGE forum back in the day. Dizzy Dust and Raging River are two of my favorites, but the selection is large with unique spices and flavors in some blends.
I was in the Beta tester group when Todd was developing
Yardbird, so that is in my arsenal too. Now, it's so popular even my Ace Hardware store carries it. After winning the American Royal one year he added the logo " "Created for chicken, but made for pork" and it truly is great on both.
And of course....
Smokin' Guns Hot, Cimarron Doc's and
Birds and Bones are longtime favorites too.