I was wondering which HD format, and how it is saved, is the best (meaning looking best)?
 Which is best looking has to do with how compressed the codec is. More compressed  means lower image quality, but it will take up less space too.AVCHD and HDV are more compressed than DVCPro HD and XDCam HD.
 Also take note that image quality is more impacted by lighting. You can have the biggest most badass camera in the world, but if you don't have ample light, your image will still look like crap.Â
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 Is hard drive, memory stick, or tape best? What about HDV, AVCHD, or some other one?
I'd go with a memory stick like P2 or SxS, but it all depends on what you want to do. Recording to tape you don't have to sweat losing your footage--it's on tape. Memory sticks and hard drives don't record drop out, which you sometimes get with tape, and the capture stages are much faster than capturing tape. Cameras that record to just a memory stick have no moving parts inside, so theoretically nothing gets worn out. Â