In the real world, I think FaceID is a bit faster and more consistent than Iris scanning on the Galaxy devices, but the difference is negligible. Yes, FaceID is more secure, but I’m willing to bet the average Joe is using biometrics as a convenient way to unlock their phone and not stash their nuclear launch codes.
Side note: I’m amazed how many people still prefer to use the 4 digit PIN over TouchID/FPS. Different strokes for different folks I guess!