In my opinion, if you are going for extreme hard use, pay some more and get the Ti version. If you are a regular knife user, the Ti is a bit overkill. The Al handles are lighter, can be anodized in more colors (You do not regularly see black anodized Ti handles), and are better priced for the same design.
I seen some hard use test fails with the Lionsteel knives, but they where done with the weaker Al version instead of the stronger Ti version. All I can say is those guys that test the weakest version of a knife, and then complain it fails, loose my trust for them as reviewer immediately.
I for one applaud Lionsteel for bringing various of their models to market with the option of Ti or Al, giving buyers a choice depending on their needs and budget.