[CelticMP]

If you already have them at gun point and they have surrendered and are obeying your commands. Why would you want to lose your position of advantage by approaching and cuffing? Let the bad guy stay on the floor with a gun pointed at him. You lose tactical advantage by approaching, someone else covering ,ie. girlfriend with gun while you approach to cover, she is not going to shoot into the ball of human arms and legs if he decides he doesnt want to be cuffed and resists. Thats my opinion from 9yrs as a LEO.

To answer your question, I have seen guys break cuffs and I have seen them break flexi-cuffs. Honestly it is up to you. Whatever you get have someone show you how to employ them properly, both can cause undue injury and the civil lawsuits (depending on where you live) can get ugly.