I've found the best jerky seasoning is the one you make yourself. Research some recipes. You will find that many of them use the same ingredients with a few modifications to give it a little heat or sweet or both. The best part is that you can tweak it to your liking.
Check out/google "Old Dave-Pos farm" he is a blogger that does a lot of smoking/BBQing that shares his recipes and some of them are really outstanding. I tweaked his jerky recipe to make one to my liking, but he helped get me going in the right direction.
Here's the link: