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gwern comments on Harry Potter and the Methods of Rationality discussion thread, part 21, chapters 91 & 92 - Less Wrong Discussion
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Figuring out how to resurrect the dead will be hard enough. Figuring out the way the brain connects to the body and reconnecting all the individual nerve connections makes the challenge much harder. I'm not sure we know all the connections even now with much better technology and decades of additional scholarship. Saving just the brain makes the problem much harder. Keep in mind that the reasons actual cryo sites offer brain only options has a lot to to with cost, storage, transport, etc and not due to thinking its a fundamentally better option.
But it is fundamentally better: the smaller the volume you are trying to vitrify, the better the process works because the greater surface area is compared to volume, and so you get faster and more even cooling (and in humans, you get problems with circulation getting blocked off after a certain point). Go read through http://chronopause.com/ . This is why you can drop small things into LN2 and they recover fine, or why Fahy could do a kidney and bring it back, but why we can't do larger things.
Those are instrumentally better reasons, not fundamentally better.