Your choice between the two popular alloys depends on the specifics of the project, including the processes you want to subject the material to, the application of the material, and the environment. 7075 aluminum is renowned for its high strength-to-weight ratio and wear resistance. For 6061 aluminum, strength may be less than that of 7075, but the material boasts of machinability and corrosion resistance. For the more regular applications such as automotive and construction, you may want to go with 6061 aluminum. However, 7075 aluminum is more applicable in high-performance and more sensitive applications such as the military and aerospace.