Is Tomato-tone still the best commercially available fertilizer or has something better come along?
I don't know that it was ever considered the "best" as there are many good ones to choose from - both organic and non-organic.
But I do know that some folks on the Tomato forum have commented on their dislike of the changes made 2 years back in the Tomato Tone formula. They talk about guarding with your life any of the original recipe you might have.
If you want a good organic mix then check out the products from Fox Farm, Gardens Alive, Dr. Earth, Earth Juice, and Perfectly Natural.
When the "New 3-4-6 Tomato-tone was introduced a few years ago, I grew tomato plants in both the "New" as well as the "Old" 4-7-10 formulation. I saw better results with the Old formulation vs. their New product. Look at the difference in the ingredients list for reference:
I am now blending a 50/50% mix of the Old with the New Tomato-tone to try to get the best of the two, until my supply of Old Tomato-tone runs out in about 5 years. Hopefully, something replicating the Old formulation will come on the market by that time.