Pro's....and con's...
 

Looking at a brake line kit....for my bird......and undecided on stainless....or carbon steel....

Any input is appreciated...

stainless is not stainproof. Also a pain to work with. I went with steel. Will never see salt.so far some water as a driver has been fine for 5yrs so far.

if you'll be bending and flaring lines yourself, nicopp/cunifer is a good option

Any reason you aren't considering a pre-bent kit? Even if you have non-factory equipment on the car, starting with a pre-bent kit will typically get you 90% of the way there. It's what I've done on my own bird. Always started with the factory lines, then modified as needed.

Thought I mentioned KIT...in my original post?

Yup, you said kit. But there are universal kits consisting of lines, fittings, etc., as well as pre-formed/bent kits.

My car is stock.....so the pre-bent kit....is what I am considering.....

I went with stainless steel and I love it. Unless you will be cutting/flaring them, you'll never run into any issues, and mine are 10 years old, and still look brand new. You may need to tighten/loosen them twice when attaching the brake hardware to ensure a good seal, but I'd do it again in a heartbeat.

This ^^^ And your fittings won't leak unless you cross-thread them.

Also agree.

Original threaded fitting size was never designed to be used with s/s, which is a harder metal; it requires more tightening torque to compress the flare for a good seal. Which could result in stripped threads, twisted threads or broken fittings.