Promoted property Vs distinguished property

[b:9028ed6bab]Promoted properties[/b:9028ed6bab] are visible outside of an orchestration and can be used for routing i.e. subscription filters, and by pipeline components and adapters. They are also limited in size – less than 255 characters. There are two types MessageDataPropertyBase (references a message node) and MessageContextPropertyBase (only exists in Message Context)
In an orchestration they are accessed using this syntax:
Message_1(PropertyNamespace.PropertyName) = 27;

[b:9028ed6bab]Distinguished fields[/b:9028ed6bab] can only be used within an orchestration and are accessed using dot notation:
Message_1.distinguishedfield = 27;
There is no size limitation on distinguished fields