Low sugar is recommended for sure. If doing pork or chicken I like to use Bad Byron's butt rub really good flavor and can find just about anywhere.
Plane salt, pepper and garlic powder works well on anything. If making you can use gunpowder or a good coffee rub
Really depends on what your cooking
Now, if you can talk Sparky into selling you some of his Voodoo rub i highly recommend it for yardbirds. Stuff is outstanding and it gets Kimmie's approval and that's hard to do
Speaking of which I'm low on it Sparky