Ti lite for me. It's hands down the best less lethal option when closed. It mitigates the need to carry a kubaton or yawara stick.
It offers 2 levels of less lethal force.
Butt end = massive bruiser. Hit an attacker with that and he will be hurtin. That could act as a warning strike.
If he continues then you can step up to the Quillion end = capable of devastating flesh lacerating bone crushing strikes. Hit an attacker with it and you will put him in the hospital if he hasn't already backed off. I would think one blow from that end would send anyone packing.
Having seen the video where the guy uses it to smash cinder blocks, I actually used it as an ice pick this weekend to break up a semi-melted bag of ice and it worked like a charm. There were solid chunks of ice that shattered like glass with just a tap. It even hurts like hell to lightly press the quillion on the palm of my hand. I can only imagine the damage it would to do someone after getting hit in the arm, shoulder, back or face with that thing.