[Rails] Validate in controller or use Rails validations?

As I prepare to add validations to my application, I am trying to
decide if it would be better to write validation logic in the update/
create controller methods or use Rails' validation methods. In the
former case, I would check the field values provided by the user
before saving to the database and redirect back to the input URL if a
validation fails. The presence of so many built-in validation methods
tells me there must be a good reason to use them. Yet reading through
the documentation I can't be sure what the benefit is. I appreciate
any guidance from the experts in this forum.

Thanks in advance,
Mark

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