SELinux vs AppArmor applicability

I am going through some primers on LSM implementations so eventually I am digging a bit into AppArmor and SELinux. I am aware of this discussion but this does not make very clear one question I am having in regard to these two LSM implementations: Is it a fact that: - SELinux must be applied system-wide (thus the auto-relabeling process on first boot which takes as much time as a filesystem scan) - AppArmor provides the flexibility to define policies only on those processes / scripts you d' like? - via the interactive auditing process) (?)