different brake line materials what do you use?

25 years ago, I went to a parts store and bought regular steel brake lines for my 69 Barracuda. I don't remember the exact length I needed, but I bought several 4 or 5 foot sections, and an assortment of other lengths down to only a few inches. I also bought several unions. I carefully bent all the lines myself with a tube bender. I was lucky. At the very end a 6" piece fit perfect, so no flares were necessary. I think I wound up using 3 unions. The brakes have worked great for 25 years. I had some naysayers warn me about using unions, but what do you think every single connection in your brake lines and hoses are? If you have a decent flare tool, buy a roll of steel tubing and some fittings. Let us all know how many times you do a PERFECT flare, and then realize you forgot to slip a fitting on the tube first. ASK ME HOW I KNOW ABOUT THAT!