A little less known but I’ve been buying Bioracer’s Spitfire Tempest Protect bib tights for over a decade. They’re the best I’ve found. They have a proper, almost wetsuit-like membrane which is totally wind proof (the most important factor in staying comfortable), are highly water repellent (and it lasts well as it’s a membrane not a coating) and have a good fleece layer. The pad doesn’t look like much but I’ve found it very comfortable on 200k Audaxes. I’ve ridden them down to -7 degrés and up to 10.
I only have two minor gripes: they’re not quite as flexible due to the insulation, though this might be because I stay a little stiff when it’s that cold, and back in the day they had better reflective details (pixel) but they’re still generous compared to Castelli and the likes who just want you to get run over in black clothing.
Stolen Goat usually sell them in quirky colours under their own name but Bioracer manufacture them.