steel
I have owned a lot of bikes. Bianchis, Colnagos,Merkx, Hampsten custom, 3 Steve Rexes, and many more. I could see a custom steel gravel bike.My current ride is a 5 yo Trek Domane and it's tough to improve on well designed carbon. I am not a weight weenie, but I like the ability to use tires up to 32c and the disc brakes are just too darn good to give up, especially on downhills or when it's wet. I even rode a Rivendell Roadeo for years.