Re: Canada is part of Five Eyes
I can see no reason for a US or Canadian citizen (or legal resident, at least in the US) to be either more or less worried about either NSA or CSIS (or GCHQ, for that matter). Those who have a need for worry, or otherwise wish to do so, should do irrespective of where their AWS or other processing and storage is located.
The US government's ability to demand Canada-resident data may be changed some by the recent New York decision concerning a Microsoft email account in Ireland, but it is a good be that the US is, or soon will be, working with other governments to smooth procedures for exercising mutual legal assistance treaties that exist (I expect there is one between Canada and the US) and negotiate them to the extent possible where they do not exist. In view of the proximity of the US and Canada, it seems likely that the procedures are fairly well established in both directions.
There probably is not much of interest here except marketing.