I haven’t played these games but read that “Killing Floor 2 is simply the best wave-based horde FPS game out there.” and the gameplay shines on the highest difficulty settings (well of course, it’s a horde game, normal or easy is like Bloodborne enemies wielding wiffle bats. that’s just mindless action that doesn’t encourage fully utilizing the full depth of the teamwork, builds and survival aspects.)
I guess the #1 reason the PS4 release timing is next month is that’s the time it moves out of early access and is considered a launch game. Could be really wild online. It’s no Left 4 Dead or Zombie Army Trilogy, but that can actually be a good thing for the horde style KF specializes in. besides, how much horde games support up to 6 players cooperating together. the more the merrier.