But when you look at the job ahead of you and the potential lifespan of the tubing that higher cost can quickly start to look rather negligible. However stainless will be more noble that the copper nickle and has a higher potential for reacting with aluminium so thats still and unknown but would be great for the caliper connection i imagine.

New Brake Line Replacement Kit 1999 2013 Silverado Amp Sierra
Stainless steel brake lines vs copper nickel. Answer to all your mini me timing questions belt cam ignition tdc teeth all of it. Wrapped brazed steel is the norm for brake lines. Inside those steel brake lines there is no epoxy or zinc alloy coating to protect your lines. This will double flare and bubble iso or single flare very easily. Original steel lines will give your mustang a classic factory original look while the more modern stainless steel lines will rust less than the original steel. These come bare or coated in polymer wrap for corrosion protection.
Plain copper tubing will not take the pressure of brake fluid. If this material fades or is scratched the plain steel line underneath is exposed and will rust. Cunifer copper nickel brake line is corrosion resistant on the inside. Stainless tubing is harder to bend and double flare. One major thing people dont realize about brake systems is that even dot 3 or 4 brake fluid will absorb ambient moisture and hold it in suspension. The replacement brake line kit i got for my mustang is stainless steel.
It will be difficult with cheaper hand held tools. Depending on where you purchase it from nickel copper tubing can run higher or lower than stainless but always significantly more than cheap ol steel. Normal steel brake line is coated in a corrosion resistant material.