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You should definitely prefer creating a new object in the vast majority of cases. Problems with reassigning all properties: Requires public setters on all properties, which drastically limits the level of encapsulation you can provide Knowing whether you have any additional use for the old instance means you need to know everywhere that the old instance is being used.
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.