Doctrine Inheritance Mapping design Pattern and performance

In my project i want to use Inheritance Mapping but i don't known how to use correctly this and if it's interesting for performance and design Pattern.

I 've got for exemple three entities

Event, EventFacebook, EventGoogle

I want to use Event as a MappedSuperclass and then have

Facebook and Google event's Entities as a child.

Those entities will contains specifics fields.

What should i use :

• Use @InheritanceType("SINGLE_TABLE") and why ?


• Use @InheritanceType("JOINED") and why ?


• Do Not use Inheritance Mapping just empty fields and why ?

Thanks for your help.