I'm interested in learning more about WWII. I've done some research and I've found two books that seem to be popular and critically acclaimed:
Which one is better in your opinion? Also, are there any other books, not necessarily covering the whole war, worth reading? (e.g. battle of Stalingrad, D-day, Nazi Germany etc.)
I haven't read that Beevor book, but the Hastings book is very good (as is all of his stuff).
In terms of books that concentrate on a specific part of the war: There are many books on D-Day, but one of the best is "D-Day and the battle for Normandy" by Antony Beevor. I haven't read it but "D-Day" by Cornelius Ryan is very highly rated.
Fighter Pilots - one of my favourite books is "First Light" by Geoffrey Wellum. He was a teenage fighter pilot and flew during the Battle of Britian, he flew with the best and survived. Its a brilliant account of his life in the RAF.
Enigma - The battle for the code by Hugh Sebag-Montefiore covers the highly secret work to break the encryption on the German enigma machine. Its a very comprehensive guide to the baffling world of encryption and code breaking. Obviously centered on the engima machine it does cover some of the history of Bletchley Park and GC&CS.
Most Dangerous Enemy - Stephen Bungay. An analysis of the Battle of Britain. Not often mentioned but I found it a good read.
Wartime Britain 1939-1945 - Juliet Gardiner. Rather than combat or military this covers the effect the war had on the general public of the UK - rationing, evacuation, the blitz, the rise of female workers etc. Its quite thought provoking.
We could go on all day! there are literally thousands of books out there. I generally look for auto-biographies and books from Max Hastings, Patrick Bishop, Antony Beevor, John Nichol & Tony Rennel, Joshua Levine and Ben Macintyre - there are probably a few more too that I don't recall but I've enjoyed books from all of them.
Hope that helps.
There's always the WWII section of the book list.