For the approx. 2 to 3 years that I've been making pizzas, I found Penzy's to be the best. I picked it up one day when visiting their Grand Rapids, MI store, but have ordered over the internet on occasion (and really like all the Penzy's products). I've bought special pizza seasoning mixes from Whole Foods, Nature's Finest, several great Italian deli's, and while many of them are very good, I still prefer the Penzy's, altho I like to experiment with others from time to time. And I've learned to appreciate adding some good oregano separate from the spice mix, tho.
One thing I've learned from using all these seasonings is that using a little is better than using a lot. Putting in too much spices can lead to a less than satisfactory pizzamaking experience -- and that after all the work and effort that you put into it. So my advice is . . . go slow and don't put in too much. Taste the sauce with your finger and add a little more if you think it could use more. But I've found that it generally doesn't need more. It will taste stronger after baking. For the WIW column. --BTB