Opinions on Fortinet vs Palo Alto for 20+ Gbit firewalls?

Just curious if anyone has working experience with Fortinet or Palo Alto
in a layer 2 transparent bridging, asymmetric routing, dual stack, 20+
Gbit/sec, redundant firewall scenario? Would love opinions, pros/cons
from real world experience, etc? Only thing I can really find is some
criticism on Fortinet's IPS throughput figures that can be as much as
half what they claim depending on the mix of signatures enabled.