I really enjoy isometric maps, probably because I am also a huge fan of isometric RPG:s like Diablo and Baldur’s Gate. Isometric maps are great at telling a story, as you can cram in quite a lot of artistic elements, more so than in top-down maps. Still, the perspective also provides the dungeon master with a good overview.
The only downside is probably that isometric maps are quite tricky to draw – at least for me!