Just from looking at the manufacturer's Web sites I would probably go with the Bushnell unit simply because of their company reputation and familiar name. All units have very similar specs and user the same power source. All of the units have built-in IR illuminators (required for Gen1). These built-in's generally do OK for short range viewing. Consider an additional IR source for longer range. Surefire makes a great one but it's expen$ive.