Ti and Cf are the top of the range materials for bikes- If you are used to Aluminium- then it rides a lot differently and steel can feel a bit firm still.

Main thing is to Test ride the two materials and in a many different manufacturers as you can. If You want someone to come down on one or the other- Then I would go for Titanium. Reason is that Any form of resin bonded material has a major flaw in that Damage starts from the inside- Where you cannot see it. Any hard knock has to be inspected thoroughly and If any dammage is seen- Or suspected- Then scrap the frame immediately.

However- Both these materials are the dream of most riders. I know TI is mine. But if after the test ride- Carbon Fibre is your favourite- Then just take a little more care with the bike and Ride it into the ground- In about 20 years I should think.

Gear has pointed something out- These frames are not going to be cheap= so look at the Custom build to get one that does fit you- As Gear has suggested