Originally Posted by
vjbknife
Ti is a durable lifetime bike material. CF is not
Design and production has far more influence on frame life than material choice. Plenty of Ti frames crack around the welds, which are notoriously tricky in Ti.
CF can have it's issues too, but CF frames can also be very durable.
I would say steel is the safest choice for a "lifetime" frame as it's the easiest to produce reliably and most forgiving material.