Because titanium is so hard, the ti stakes can be thinner than the aluminum ones. Thus, they are slightly lighter. I've observed that many people who go with ti stakes are using 10-12 stakes for their tarp set up. At that number of stakes, the slight weight difference adds up. At the 2 to 4 stakes I carry for a hammock set up not so much.
_________________________
If I wouldn't eat it at home, why would I want to eat it on the trail?