They do squeal when cold and in reverse. More of a squeak than a squeal. But never in forward direction or on all but the very coldest days. Just as easy to work on, replace pads etc as steel. Yes, they cost more but they last longer ( so cost is somewhat compensated ).
Having had both, I would not seek out ( nor avoid ) one or the other
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2012 A6 3.0 TDI Avant, Silver, 7 Spd STronic, Bose, ACC, Advanced Parking Camera, Power close / open tailgate, Side and Lane Assist, AMI & Jukebox, Adaptive lights with corner and high beam assist, Through load with ski bag, Audi pre sense plus, sports diff and sport suspension, Panoramic roof, Storage pack, MMI touchpad and VIM, etc. Oh and now retro fit rear seat entertainment 
2019 BMW I3. Heat pump, Winter, professional and comfort packs, Harmon Kardon, autopilot
2022 Mercedes EQC 400
Previously: 2009 S8, Silver, B&O, Ceramic Brakes, Advanced Parking Camera, VCDS
2008 A8 3.0 Tdi sport, B&O
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