I made the Braided SS switch..
I was a huge fan of the plastic lines when I built my -4 because they were simple, light and easy to DIY the length and routing. However, after 10 years of service, I found myself continually tightening, snipping and re-furreling the ends to keep from having leaks ,mostly at the high pressure caliper end. The final straw to the demise of my plastic lines was loosing my left brake on the departure taxi from OSH this year (made it back to NC with just the right brake). I have switched over to all SS braided AN fitting lines, and hope to never have any more issues. I never did have any leaking of the low pressure side, but mine were all plastic fittings as well as lines (no brass other than the ferrule. I believe time, temperature and other environmental subjection take a toll on plastic system and eventually they become BER.
8A7 / Advance NC