IT really depends on the type of business you had currently. These days almost all security vendors are offering Virtual Appliances so it's a preference based decision. Almost all vendors are offering basic features with some add-ons / additional features with differences…

Below will be my first, second and third choice. It really depends on situation as all are really good if it's only firewall then Cisco is the best for budget and features Fortinet and Sophos are great. I hope sometime Sophos will make it to top of the list also 1-…