Venom is the #1 trusted bushing brand. Hand-poured by the team themselves in the USA.
Legend has it, Zak Maytum used to pour these bushings in his garage and peddle them at races back when the scene was mostly Euro dudes on stock Randals and footbraking heavily. He worked tirelessly to make a bushing with tight tolerances and a solid center without sacrificing turn and lean.
Years later, the bushings are made en mass and are the top choice for pros. Don't believe me? Go to a race. check out a few set ups. Venom bushings. All around. Cannibals, everywhere. More than occasionally Rouges. It isn't because Zak is super cool and everyone wants to skate like him (though that's kinda true), it's because it's the best urethane formula in the game. They lean as much as you need and then return to center without bouncing you off. It feels like how trucks are supposed to feel. It seems obvious, and like you can't go wrong making the little thane donuts, but you'd be surprised. Since Venom took over, all the other options suddenly much less appealing.
If you're not riding Venom you very well could be doing it wrong.
A little about Duro:
These suggestions are a bit on the softer side, but hey, we like to turn. Some skaters don't. And Venom tends to run just slightly harder than other brands. A wise man once said, "loose trucks save lives." But basically, play around with it. Everyone likes a different feel. What you definitely want is a harder durometer boardside and something softer or even a cone shape roadside. And if you're riding splits or doing DH or freeride really fast, put harder bushings in the back to keep from wobbing. For regular freeride and going switch, stay symmetrical.