Two bikes I owned came with aluminium foot pegs. I found the teeth tended to wear smooth prematurely, which on occasion allowed my feet to slip off.
One of the pegs shattered in half on a rock. I have S3 Hardrock steel pegs, which I have swapped between three years/three bikes, no problems and I imagine they would bend, not shatter, when I hit a rock.
I'm not sponsored by S3 or anyone.