I use both. The thumb snap, if designed correctly, isn't really an issue from a practiced draw. The biggest area of concern, for me, is the retention of the tension retention systems. On my check six, for the Ultra Carry, the retention screw is below the finger guard. Pretty much ineffective accept for total retention of no retention. The maker claims the belt is supposed to be part of the retention too. I call that a less than desirable design to allow someone/something else determine how well my product does its job. On one of my hybrids, the kydex is attached to the leather by way of screws and rubber O rings. They become the retention adjustment and are very serviceable. However, I would not use either of them or my DeSantis while riding. If on my bike, I want an extra measure of security and will always opt for the thumb snap.