I had to go with Titanium because it was cheaper than steel.
I've had my Colnago Super (steel bike) for 33 years now, and it is approaching its 50[SUP]th[/SUP] birthday. And the paint is just really bad. I think it has either serious UV damage, or simply dried out. Anyway, multiple wear spots, and where the paint isn't worn, it is just flaking off. And rust is showing through everywhere. Not a pretty sight.
So, now with my "new" Litespeed. The decals may eventually wear off. But, it will never need repainted. It makes a serious rain bike that I can just wipe down.
As far as forks.
Colnago used steel forks on many of their Titanium bikes.
A few Titanium forks are available, but expensive, and the Chinese ones just don't look quite right.
I currently have a bonded aluminum fork on my Litespeed, and it is doing well for me. I did track down a CF Litespeed fork, but I haven't decided whether I'll mount it yet. I'll probably ride the aluminum for at least for a while longer.
Keep in mind that many aluminum frames also use carbon fiber forks, and sometimes seat stays.
Anyway, I'm riding Titanium at the moment because it was cheap. And, so far, it seems to be quite durable. However, had I not gotten the deal on the frame that I got, I'm not convinced that I would have been better paying more for a titanium frame than I would have otherwise paid for 3 or 4 steel frames. Say I got 10 years out of each steel frame... then upgraded... I could always have one looking nice.