As with many aspects of Skateboarding equipment, personal preference is the number one qualifier when asking "which is better?" As a general rule, though, weight is not something that has any benefit on a skateboard. Therefore, as a rule, lighter trucks are "better." However, although there are a few truck brands who advertise that they are lighter, the difference in weight between the professional quality trucks is fairly small. The heavier trucks tend to be the cheaper ones made out of cheaper material, often cast in China and not backed or promoted by a professional team.
With almost every aspect of skateboarding gear, the brands that are made by skateboarders and supported by skateboarders, are the best quality products. These include these brands: Independent, Thunder, Venture, Ace, Silver, Royal, Krux, Theeve, Destructo, Ruckus, Force, and probably a couple others.
Check these brands, or any brands that catch your eye, but be sure to see that they are backed by real professional skateboarders before making your purchase if you want to ensure that you're getting professional quality product.
Note: these brands are the most successful brands in contemporary street and park and vert skateboarding. Longboard skateboards have evolved into an entirely different group and while the quality of the products for longboards is just as important, a whole new set of standards and products has emerged designed specifically for those boards. Do research to find out what works for these boards... although Independent, Thunder, Ace and Theeve all have great turning radii for longboards as well.
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