Firewalls and what do they eat with?

Question

firewall

Good evening, I undertook to write a research paper on the topic "Selecting a firewall", but I encountered a very unpleasant thing, information on the Internet on this topic is extremely scarce or outdated, I would like to consult with experts, namely, I am interested in the following: What are the main characteristics of the firewall screen? Whose products are in the greatest demand in Russia? What features should be included in the firewall for use:
1) Personal
2) Small (medium) business
3) Large firms.
Thank you.

Answer 1

Solutions from CheckPoint are quite popular in addition to ciscos.