When presented with a simple table view (or even a list view I suppose) what is your preferred method of entering new data.
With add/delete buttons like this: 
Or with a blank line indicating a new record like this: 
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The question is a bit open to opinion but personally I prefer the add button, it is much more explicitly clear to the end user.
The blank line can look like just another line of data, not an opportunity to add something.