I think my review of the World's Biggest Bookstore will be a little biased because I've been going here since I could first read. Things have changed over the years...including my reading level :-), Even though I've ordered books from Amazon.ca because of convenience (and sometimes price), shopped at closer Chapters bookstores because of distance, I always still come back to WBBS.
There was a nice little magazine shop called Lichman's where I would go for UK magazines however they have since folded, but WBBS carries on stocking more magazines than I could possibly ever read (including the UK and other worldly variants and newspapers). The sheer selection alone of books of every genera (and all age groups) is reason enough to stop in. Chapters now owns the World's Biggest Book Store and in turn their various stores have almost caught up to the enormous book/magazine selection of WBBS, but I believe they will always prevail. There isn't the cushy seating selection dispersed through the store, or fireplace chat of local Chapters either, but when looking for a book on a specific topic, I would start here.
Once, it was one of Toronto's largest bowling lanes, but now is one of my guaranteed stop-ins when looking for a book on a new topic of interest.