About using canonical and robots.txt block

dontgo

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Jul 29, 2016
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Hi, again, gurus

This time I want to ask when or under what circumstances should I use canonical tags for duplicated pages, and when to use robots.txt to block them?

as an example:
Assuming I have two versions of urls
A : /shop/page***
B : /sale/page***

The pages have almost exact content and A is the main version I want.
So should I use "rel=canonical" to point B to A; or should I just simply block /sale/ in robots.txt?

Don't know if I express clearly enough, so forgive me for that, plz.

Thanks in advance
 
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