That's a tough call. QAD is a very nice rest but I prefer the TT Shakey.

It is quiet and dependable. I have added a Cobra arrow holder to make the entire setup full capture. As I draw back, the arrow slowly slides out of the rubber fingers of the Cobra and my TT Shakey takes the arrow up into the air. Then I am in business. You can even turn the bow upside down and shake it. That arrow is locked in rock solid.

The QAD for me was just do darn expensive and had too many moving parts. If you had my luck you would understand that more parts equal a greater opportunity for failure.

You should go to your local pro shop and try them both out. Any good shop will let you do this before you buy. Best of luck!