Kernel-based
As the name suggests, KernelSU works under the Linux kernel giving it more control over userspace apps.
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Root access control
Only permitted apps may access or see su, all other apps aren't aware of this.
Customizable root privileges
KernelSU allows customization of su's uid, gid, groups, capabilities, and SELinux rules, locking up root privileges.
Modules
Modules may modify /system systemlessly using OverlayFS providing significant flexibility.