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Most middle to high quality upholstery manufacturers use seat cushions made of a polyurethane foam center wrapped in a soft dacron layer. This is a good option for most consumers.
Some high-end upholstery manufacturers like Hancock & Moore use Qualux cushions wrapped in dacron or similar. Qualux has a reputation for keeping its comfort and firmness for a longer time than polyurethane foam.
Shredded foam fill is the worst option for seat cushions. It's cheap and easy for manufacturers to use, but it clumps up quickly. Avoid any upholstery company that offers this type of seat cushion.