The differences are fairly significant, and each have benefits
The old - Circuit Switched Data (CSD)<ul><li>Speeds up to 14.4kbps </li>
<li>Speed is generally consistent </li>
<li>CSD is used for dialing into ISP's, Quick Net Connections (QNC, Q2N, Quick 2 Net, etc) </li>
<li>Connection can be set to "time out" by the operator </li>
<li>1/2 to 1/4 the speed of a conventional dial up modem connection (very slow) </li>
<li>Time used by this data connection, subtracts from your plan minutes</li></ul>
The new - 1xRTT Packet Data (PPP)<ul><li>Speeds up to 307kbps(153kbps in current implementation) </li>
<li>Operates like a DSL or cable connection </li>
<li>Speed fluctuates based on transmit and receive demand </li>
<li>Connection speed does not reflect the throughput you get. Generally, you will connect at 9.6kbps, then it will start fluctuating and spiking </li>
<li>Connection can go dormant, allowing you to make and receive calls. </li>
<li>2x-4x the speed of a conventional dial up modem connection </li>
<li>Usage of this type of data connection is generally billed by the byte although it can be billed it by the minute depending on your plan</li></ul>
Source:
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