Both provide their advantages. A plug-in hybrid might suit someone who lives inner city, where trips are commonly short in duration and distance, so that the vehicle can mainly use the electric power it has without needing to significantly access the motor.
The benefit continues for longer trips away, where charging infrastructure may not be as readily available, and the vehicle is able to rely solely on its engine.
An electric vehicle doesn’t require fuel and because it has fewer moving parts to service (including no engine or transmission), it should generally be cheaper to operate overall. However, you need to charge the battery at regular intervals, so some pre-planning will be needed for longer trips.