Mild Hybrid (Mhev) vs Plug in Hybrid (Phev)

The electric technology is evolving very fast and how more and more cars are either Mild Hybrid (Mhev) or Plug in Hybrid (Phev). The traditional engines are going away and are being replace with this new generation of engines . Which technology do you thing is the best for you ?
Source:
Audi: www.audi.com/en
Volvo: www.volvocars.com