I think it depends on what you intend to do with the finished product.
Do you plan on putting a small based vase of flowers on it - the small base combined with the flowers on the top would make it less stable so I would opt for no batting.
Do you plan on putting a large based bowl of fruit on it? If this is the case I would opt for batting because it will protect your table top from getting dented from the edge of the bowl when placing it down on the table.
If you want both protection and flatness ... you can use batting and just quilt it heavier.