Hi,
Newbie here. Getting my bike real bike and need help selecting one. This bike will be casual/exercise use and I have narrowed down to a cyclocross. The ones that I am trying to decide between are

Motobecane fantom cross comp Ti
Save Up to 60% Off Titanium Cyclocross Bicycles | Road Bikes - Motobecane Fantom Cross Team Titanium | Cross Bikes

Motobecane cross team
Save Up to 60% Off Cyclocross Bicycles | Road Bikes - Motobecane Fantom Cross Team Aluminum | Cross Bikes

The major differences between the two are:
One has a titanium frame and shimano 105
The other has aluminum frame and shimano ultegra and is about a $100 more.

So I need help deciding if I should go with the Ti frame or go for the Ultegra setup. Any other suggestions are also welcome.

Thanks