Basically the difference is the Ti has scissors and a large phillips screwdriver standard.
The Xti has a cutting hook, blasting cap crimper and 2 large large bit drivers instead of 1.
Links:
Leatherman Charge Ti
Leatherman Charge XTi
The Xti has a cutting hook, blasting cap crimper and 2 large large bit drivers instead of 1.
Links:
Leatherman Charge Ti
Leatherman Charge XTi