The larger the surfer the easier it is to ride, but bigger sizes limit tricks. The opposite is true of smaller boards. I learned to surf on a landlock. Its a bigger board and let me get the feel and riding without a rope. You can take the fins off and do some spins, but flipping that big board could be painful. I now own an Inland surfer - Chubbie. One of the smallest boards avaible.
From what I have read - all the trick surfing is now being done with skimmboards. They are even smaller than my Chubbie. Guess it depends on what you are wanting to accomplish.
P.S. Really like the Inland surfer - yellow looggie.