Is there any or much difference in running one of the three types of wu's in terms of points per hour - both for the cpu, gpu, and multitasking the gpu? I ask because I really don't have a preference in terms of the science. As of now I haven't selected Astropulse to run. Thanks for your consideration of these questions.

There are only two types of tasks these days: astropulse and multibeam Seti v7.
The Seti Enhanced v6 is what was before Seti v7. Before Seti Enhanced you had Seti Classic 2, 3 and 4, before it went to Seti@Home 5.28, which was superseded by Seti Enhanced v6, which has now been superseded by Seti@Home v7.

Each of the following science application can do more with the data, look deeper into it, see better through radar blanked areas etcetera. This is also why it can happen that older data is being looked back at, because the science application can do better than its predecessor.

For the specific FAQs on what the two look for:
Astropulse FAQ
About Seti@Home.

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I didn't realize there were only two variations. Thanks Ageless. May you live forever. :-)