serializable

• is a standard Java interface not part of Android SDK.
• The problem with this approach is that reflection is used and it is a slow process(if not properly used).
• Reflection is the term for inspecting objects, fields and methods at run-time via Object.getClass()
• Serializables are better for persisting data.
• easy to implemet(just implement the Serializable interface and Java will simply do its best effort to serialize it efficiently).
• Serializable tends to create a lot of temporary objects and cause quite a bit of garbage collection.

Parcelable

• is an interface and part of Android SDK.
• Parcelable was specifically designed in such a way that there is no reflection when using it.
• we are actually writing custom code.
• is faster than Serializable in case of default implementation.
• Parcelable interface takes more time to implement compared to Serializable interface
• Parcelable array can be passed via Intent in android.
• There are plugins that help creating Parcelable.