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In a nutshell, both are used to set a priority within the packets so that switches and routers can process the traffic at various priorities. For instance if you set the QoS (quality of service which corresponds to the first bit of the type of service) bit to 5 (high priority) data packets set to 0 – routine, get processed and queued while allowing the higher priority voice packets to process. QoS is a layer 2 mechanism while diffserve is a layer 3 mechanism.
Here is a link to a good article that may answer some more questions for you.
http://www.tmcnet.com/it/0503/0503NetIQ.htm
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