Encyclopedia Britannica will no longer publish a print edition. You can still get the 2010 edition, and some years of update volumes, but the 2010 will be be last print edition.
We had a Colliers Encyclopedia when I was a boy. I used Britannica at the library, but never liked Britannica’s division into three parts – Macropedia, Micropedia, and an Outline of Knowledge. Colliers was simply alphabetical.
Our Colliers Encyclopedia had acetate transparent overlays of the internal combustion engine, of the human body, and of a frog; maps of everywhere; articles on everything important (by definition); and an update volume every year for 10 years – an under-rated and under-used feature. I would have kept the Colliers but for the space – 24 or so large heavy volumes plus annual update volumes takes up a lot of shelf, and the encyclopedia was inevitably out of date on many topics.
Since then I’ve had Britannica on CD ROM and DVD, a free copy of Encarta (not a bad product, as I recall), for 5 or 6 years a personal subscription to Britannica Online, and since then varying levels of library data base access to Britannica Online and other things. The local library has a copy of Britannica, which I have occasionally consulted.
I’ll use Wikipedia for casual look-ups – what country is north of Zimbabwe; what’s Upper Volta called today; who plays Raj on Big Bang Theory? But for anything important I follow the reference (if there is one), find the answer in some reliable reference source, or go to the library.