Almost any brand of tire is better than the Goodyear Wrangler RT/S tires that Ford puts on the Sport Trac's
It all depends upon what you are looking for in a tire and what you are prepared to spend. If you are looking for strickly a performance tire you will get a very short treadlife. If you go for long wearing tread, you will get a harder tread compound and ususally less wet weather traction. If you drive off-road, you will need more of an all-terrain tread, which may be noiser on the highway.
If you stick with a brand name like Goodyear, Michelin, Bridgestone, BF Goodrich, and only purchase their primium brand tires you will probably be happy, although these premium tires can be exspensive. Just remember that like all things, most tires are a compromise and one tire does not fit everyones needs. You must decide what kind of tire best fits your driving conditions and style, and pick the tire that best fits your needs and your budget. Nobody can do that for you or for me.
Many of the tires mentioned above, I would not want on my Sport Trac because they don't fit with where I drive, and how I drive, but they may be the perfect match for that person.
...Rich