You’re looking at it wrong. You don’t want a fingerprint scanner or a facial scan. What you actually want is simple - authentication that you are using the device, not someone else. You want high security with low friction. Without debating which one is actually more secure tech, let’s just agree that either one is sufficient, which means one of them is redundant. You can either give consumers the choice like Samsung and include both fingerprint and facial scans, OR you can make the decision for them like Apple did and leverage what’s already in the device - a front camera.

Both answers are acceptable, and really illustrates the design ideology between each company. They both have their place in the world.