Why only 2? Lancom, Ericsson, Securepoint, A10, com2, Gateprotect, linogate, Mikrotik, secunet… Granted, most of them do firewalls, but making a switch is relatively easy, if you already have experience in that field.
If we take in Taiwanese manufacturers, things look extremely competitive between those two alone.
Most admins just use Cisco or Aruba stuff because they are extremely lazy.