I have worked with all firewalls and the two that stand out are Checkpoint and Palo Alto.the disadvantage with Checkpoint is the cost of the device and training but it has been around the longest.if I would recommend any firewall it would be the Palo Alto due to the real…

Different vendors have a slower speed for each option you enable on their devices so overestimate the size.  Some vendors will tell you the % of slowdown but consider double the line speed to compensate for the device's slowdown.