EGW 6061 is also extruded. Their 7075 is machined from bar stock. They are also machined differently. The cross slots are not center cut on the 7075 HD rails.

No comparison in terms of strength.

Cheap 6061
https://www.egwguns.com/remington-7...ra-b14-short-action-picatinny-rail-0-moa

Reasonably priced 7075
https://www.egwguns.com/hunter-seri...ra-b14-short-action-picatinny-rail-0-moa