I answered a similar question in another thread and this was that post
It helps if one understands why we have grounding electrodes for in the first place.
In the 2011 NEC we have eight grounding electrodes and are instructed to bond any and all that are present together to form the grounding electrode system. They are 1) 10 foot of metal water pipe, 2) Steel of a building that is effectively grounded (connected to earth) 3) rebar in the bottom of the footer, 4) ground ring that circles the building, 5) rod or pipe, 6) chemical electrode, 7) plate electrode, 8) oil drum buried in the back yard.
If the electrode system is a metal water pipe, single rod, pipe, or plate electrode then it is required to be bonded to another electrode as outlined above.
The electrode system serves four purposes and these four purposes only. They are installed to help dissipate lightning, line surges, unintentional contact with higher voltage lines, and to stabilize during normal operation.
In most of Florida ground rods are not used due to the water table. Driving an 8 foot ground rod can cause water to ooze out to the earth. Orlando is only 8 feet above sea level so think about knocking a hole in the bottom of Florida should one drive a rod eight feet down and sinking Florida to the bottom of the sea.
I live in the center of NC and am 689 feet above sea level so driving an eight foot rod into the earth will not knock a hole in the bottom of the most beautiful place God ever created and it will not sink to the bottom of the sea.
To say one electrode is any better than any other electrode is nothing but a wives tale. Remember why we are installing an electrode for, it has nothing to do with how our system works but is there only to dissipate unwanted current to protect our systems from high voltages generated from an outside source.
Should we drive a rod and connect it to a 15 amp breaker the breaker will not trip. 120 volts divided by 25 ohms will equate to 4.8 amps but should the primary of the transformer touch the service drop then it would be 7200 volts divided by 25 ohms that would equate to 288 amps and clear the fuse on the primary side of the transformer. Lightning is a very high voltage that is seeking a connection to earth therefore an electrode is needed. Lightning 30 miles down the road can cause a surge on our homes and again an electrode is needed. Look at your switch cover, see those two 6/32 by ½ inch screws? We connect to earth to keep those screws stable during normal operation.
The grounding electrodes have no role in the normal operation of our electrical systems. We wouldn’t know if there was one or not in everyday use of our electrical systems. The equipment grounding conductors of our electrical systems are bonded to the grounded neutral conductor at our service equipment in order to establish a low impedance path for clearing fault currents in our systems. This fault clearing path will work without a grounding electrode system of any kind. The grounding electrode system plays no role in the fault clearing of our systems.
The grounding electrode system is installed for the reasons outlined below as mentioned above;
250.4 General Requirements for Grounding and Bonding.
The following general requirements identify what grounding and bonding of electrical systems are required to accomplish. The prescriptive methods contained in Article 250 shall be followed to comply with the performance requirements of this section.
(A) Grounded Systems.
(1) Electrical System Grounding. Electrical systems that are grounded shall be connected to earth in a manner that will limit the voltage imposed by 1) lightning, 2) line surges, or 3) unintentional contact with higher-voltage lines and that will 4) stabilize the voltage to earth during normal operation. (numbering was added by me)