There are many issues to consider before you can choose the right window or door for your commercial space. The basic function of windows and doors is to admit daylight and ventilation in acceptable and consistent quantities, while maintaining the ambient temperature inside – this is your overall comfort level. But this needs to be balanced against your requirements for what you want to see through them and how much privacy you require. You should also consider how the windows and doors need to blend with the overall style of your commercial space, both in design and colour.
From a safety and security aspect you need to have the appropriate style of window or door for each location. And finally if noise is an issue you need to understand the impact of using certain styles of windows and doors, and glazing options.