All bike frames have very low rates of failure. But all things being equal, nothing quite tops Ti, particularly compared to CF. Ti won't bend as easily as CF will crack in a crash too. But all this hand wringing over CF breaking I see on BF is rather preposterous. Here's a newsflash: my 1991 Merlin Ti (straight guage tubing) cracked in two places (downtube, chainstay) in 1996, no crash or mishap involved. So much for Ti being indestructible.

It all can beak weenies. It just doesn't happen very often. I would guess the durability rankings for bike materials would be:

1.) Ti
2.) Steel
3.) CF/Alu

Does anyone know if CF is more or less prone to failure than Aluminum??