Newsstands are not always rarer in high grade. As a general rule, the closer to 1980 the book is, the less likely that high grade newsstands are anything special.
Or, to put it the other way... the further from 1980 the book is... the more it might be helpful to locate a high grade newsstand.
Key word being "might". Like almost all books... the "rarer" version of an unimportant book is usually also unimportant.
... and that's why books like Amazing Spider-man #667 selling for thousands of dollars makes little sense to many collectors. It's the "rarest" version of nothing special. Wow, let's fork over some bags of cash.
Canadian Newsstand editions are the ones to go for. Regular newsstand is way too plentiful and there is generally not much of a value difference if at all.
If you're Canadian.
If you're from the USA then the Canadian newsstands are like North American Pence copies.
As long as American collectors keep paying premiums for Canadian newsstand variants you can call them whatever you like.
I'm waiting for a premium offer on the Canadian newsstand that I have...
That is the Quebec edition, not Canadian........