> 5. The focusing system is usually way better. DSLRs depend on a translucent part of the mirror to direct some light onto a focusing sensor. Mirrorless cameras

> 5. The focusing system is usually way better. DSLRs depend on a translucent part of the mirror to direct some light onto a focusing sensor. Mirrorless cameras have a load of split pixels scattered across the main sensor, that allow them to do phase-shift focusing. But because they're using the main sensor, they can do things like work out where people's faces (or even eyes) are, and focus on that. I might be wrong, but I thought most DSLRs use phase detection, while mirrorless cameras use contrast detection. Phase detection tends to be much faster, but contrast detection is more accurate.