There are a number of factors to consider when selecting the timber:
Hardwood is generally preferable to softwood in decking construction as it is not only stronger, and more durable, but it often possesses a richer timber hue and is more attractive.
Although hardwood is more expensive, its durability means that it will stand the test of time. Popular hardwoods commonly used for decking include Spotted Gum and Jarrah. Treating your hardwood deck regularly with a good quality timber finish (such as decking oil or timber stain) will ensure that your deck lasts and retains its colour and beauty.
Softwood such as pine is a cheaper option than hardwood, but it is not as durable and needs to be treated before it is used in timber construction.
Ground clearance is necessary to ensure ventilation for your deck. Check the Building Code of Australia for all requirements.
No matter what your decking needs, Choice Timber can advise you on the best timber option.