Brief discussion from before Anniv, 42 and Pacific 40 came out.
I can’t really recommend D-Day.
BOTB is a very traditional style wargame and a radical departure from the other A&A games. Still my favorite.
Guadalcanal brings some of the aspects of BOTB a little closer to a traditional Axis and Allies game. Te movement mechanic makes the game feel fast paced.
Anniversary was a limited run and tough to find and running over $200 a copy on Ebay. Adds Italy and many rules changes and new concepts.
42 is essentially Revised only they incorporate a lot of the rules changes from Anniv. (Haven’t played it yet and probably won’t as I have Anniversary.)
Pacific 1940 is an update of the earlier Pacific adding many new units and concepts from Anniv. It is supposed to combine with Europe 1940 due out this summer for the biggest global variant yet. (Haven’t got to play it yet either.)